Best Snow Teeth Whitening Kit To Buy For Students

Best Snow Teeth Whitening Kit To Buy For Students

Snowfall is actually a forerunner on the property teeth whitening market. The exclusive whitening formula is praised for having the ability to erase even the hardest discolorations without creating sensitivity. SHORTCUTSProfessional-quality teeth whitening at homeOver 500,000 satisfied customersSuperior results without leading to sensitivityHelps eliminate tough coffee and also white wine stains30-days money back guaranteeSnow makes teeth whitening convenient without any office sees, uncomfortable bits, or even unpleasant application.

The Snowfall treatment is actually an LED-activated pearly whites whitening body that targets all sort of blemishes. This includes those triggered by white wine, tea, coffee, and cigarette. The patent-pending light-accelerated modern technology leads to no adverse effects, as the insights are actually certainly not harmful. It is FDA-approved, enamel-safe, and does not induce sensitivity. You do not need to have any kind of dental expert gos to or even prescribeds to perform the therapy from the comfort of your personal property.

Best Snow Teeth Whitening  Kit To Buy For StudentsBest Snow Teeth Whitening Kit To Buy For Students

Snowfall also rejects to examine on creatures. There are two packages to decide on. The materials of each should last for over 90 uses. Let’s break down what they include and also just how to choose the finest one for you. This set is Snow’s best-known product, because of which they obtained their recognition.

The All-in-One kKt from Snowfall has: a wired LED mouthpiece,3 whitening sticks,1 extra-strength whitening stick, anda cover overview. The mouthpiece works with the Snowfall application, therefore you can regulate how deeply you intend to whiten your pearly whites. Best Snow Teeth Whitening Kit To Buy For Students. It includes a cable that permits you link to USB, apples iphone, as well as various other smart devices.

Best Snow Teeth Whitening Kit To Buy For Students

It might be noticeable, however the largest difference in between the two kits is the wireless function. Over three million were actually invested on experimentation, bring in new functionalities feasible. The contents of The Wireless Charging At-home Pearly Whites Whitening Set include: a wireless LED mouthpiece, a docking terminal,3 whitening wands,1 maximum stamina whitening stick,1 making less sensitive cream, lip procedure, USB cable television, andan user’s manual.

The last function makes it possible for the procedure to be actually gotten used to your needs. It systems immediately, therefore all you possess to perform is actually activate it on the app. The mouthpiece is water resistant. This suggests you can securely utilize it in the shower. What’s more, it sanitizes itself while billing. There is also a red-light treatment option for your periodontals.

According to analysis, it assists: remove germs, minimize pearly white sensitiveness, enhance blood stream circulation in the gums, prevent receding periodontal lines, rise bone density, andminimize post-whitening swelling. The docking station features an unnoticeable style, clients often contrast the technique it aims to a bluetooth sound speaker. Besides cleaning as well as billing the mouthpiece, it also functions as a penholder and also trip situation for your cream wands.

Impacts are actually assured to be actually obvious after 7 times of making use of. The kits are actually quick and easy to use best away from package, so just about any person can easily whiten their pearly whites along with Snow items. Listed here is a standard guide: Safe forThose with crowns, links, and also veneersTeeth with fillingsPregnant womenBreastfeeding momsSensitive dentitionAdditionally, they ship their items worldwide, therefore your site won’t restrict you.

Best Snow Teeth Whitening Kit To Buy For Students

It is suggested that you brush and also dental floss your pearly whites before doing the procedure. Dental hygiene helps get rid of any food items fragments and also pollutants (Best Snow Teeth Whitening Kit To Buy For Students). This allows even protection of the product. You wish all areas of your teeth to become brightened!Moreover, oral plaque buildup as well as micro-organisms, which at times acquire caught in between the serum and the pearly whites, create it most likely for you to experience dental caries or other oral issues.

This action is actually not needed if your dentition doesn’t ordinarily react to temperature or even delightful or difficult foods items. It certainly not merely decreases sensitiveness but additionally builds up the pearly white enamel. The formula is also loaded with minerals and vitamins. If you choose to make use of the desensitizing product, do this 15 mins before the whitening session and after that rinse.

Make use of either the routine or extra-strength whitening cream, depending on the outcomes you really want. Twist the stick to acquire the product out. You might need to do this approximately 30 opportunities when you to begin with use it. The comb tip are going to help you use the serum. Envision you are repainting a white colored picket fence (Best Snow Teeth Whitening Kit To Buy For Students).

If you love your gum tissues clean it off the most effective you can. A percentage won’t hurt, but the product was created for pearly whites only. The wireless LED unit has a “shake to wake up” feature. Listed here are the overall guidelines for this attribute: Shake once to switch it on.

Best Snow Teeth Whitening Kit To Buy For Students

A 3rd opportunity for the gum tissue therapy. Drinking it four opportunities will put it to sleep. You can easily additionally download the app to individualize your treatment. Once you are done, place the lighting back right into the holder. If you have the wired mouthpiece rather, just link it up to your phone to activate it.

Keep it in for 9 to half an hour on a daily basis, 21-30 times straight. If you happen to experience some sensitiveness, take a 1 to 3-day breather as well as proceed the therapy eventually. It is actually finest to perform your sessions before going to mattress. By doing this they don’t disrupt eating or consuming.

The cordless kind will self-sanitize while demanding. Store your whitening sticks in the refrigerator after utilizing all of them. This can easily aid all of them maintain their stamina over a longer time period. The kits include a source for months of applications, so it is actually a good suggestion to take the very best feasible treatment of your items.

The body may be matched up to a professional therapy setting you back $500-$ 1,000. For a much reduced price you may do this coming from the convenience of your own property. You can purchase your Snowfall whitening set exactly on their website, however it’s likewise offered on Amazon.com. Listed here is a summary of the amount of Snowfall whitening products presently expense: ProductPriceAll-in-one package$ 199Wireless charging set$ 299Extra toughness refills$ 49Add-on for delicate teeth$ 25Serum refill sticks$ 25There are also remittance options for those that do not would like to be actually out the cash at one time – Best Snow Teeth Whitening Kit To Buy For Students.

Best Snow Teeth Whitening Kit To Buy For Students

Best Snow Teeth Whitening  Kit To Buy For StudentsBest Snow Teeth Whitening Kit To Buy For Students

This are going to happen automatically and no expenses will be actually delivered, so you may simply appreciate your items. There is likewise a 30-day money-back promise and also a 5-year manufacturer’s warranty on electronics. It holds after you activate it on the Snowfall website. SHORTCUTSProfessional-quality teeth whitening at homeOver 500,000 delighted customersSuperior results without resulting in sensitivityHelps clear away hard coffee and also a glass of wine stains30-days refund ensure Authority Dental approves percentage coming from 3rd party firms.

After seeing social networks flooded with individuals going crazy about how incredible the Snowfall Pearly white Whitening body is actually, I needed to discover. One that blends all the very best pieces of teeth whitening and neglects all the poor ones? Yeah, sure (Best Snow Teeth Whitening Kit To Buy For Students). If you are actually a powerful believer that everything as well great to become true is exactly that, below’s a teeth whitening system to show you incorrect.

Snowfall is additionally very inexpensive, at lower than 1/10th the price of professional whitening at the dental professional. Additionally, Snow Pearly Whites Whitening carries out not create sensitivity. You may have your gelato as well as eat it too! Or is actually that cake? Regardless, you can easily possess both when your teeth aren’t dropping out coming from bangs of chemical therapies that white strips typically contain.

Honestly,. The LED ignited mouthpiece speeds up the whitening from the gel on your teeth causing much faster, much longer long lasting and also even more effective whitening without resulting in sensitivity. The LED illumination enables you to use Snowfall for a shorter time period with the same whitening affects compared to other systems.

Best Snow Teeth Whitening Kit To Buy For Students

These are true, overdue Snowfall clients’ reviews/before as well as after teeth whitening photographes undergone our team within the last 30 times. These are actual, unpaid Snow clients’ reviews/before and also after teeth whitening pictures provided to our company within the last thirty day. Outstanding item !! A single that has actually benefited me! And no sensitiveness!! AMAZING!! Bought this emotion incredibly skepitcal (Best Snow Teeth Whitening Kit To Buy For Students).

Best Snow Teeth Whitening  Kit To Buy For StudentsBest Snow Teeth Whitening Kit To Buy For Students

Love it !!! Finest amount of money I have actually spent on a doubtful product. Finally something that definitely stays up to its own cases! I have actually been actually utilizing this as well as would advise, I’ve found a distinction after 4 days I love this item! I have actually only used it 3 times simple to use and also no sensitivity…, I also failed to remember to utilize the after product for the gums the initial 2 opportunities! …

It carries out specifically what they claimed it would do, yes to every little thing!!!! I was actually pretty suspicious yet I am actually extremely amazed after 2 usages today. “The very best teeth whitening system for sensitive pearly whites” “Take teeth whitening to the following confess an at-home package that equals a check out to your neighborhood pleasant dental practitioner.” “Two friends talked about exactly how white colored my teeth looked after using this set only pair of times!”.

When you get the Snowfall whitening system, you obtain the complying with in every set: Cream wands LED holder Umbra resource that assists you track your progression Directions on just how to use the systemGetting began along with Snow is very easy, and the resource is going to stroll you via everything you need to recognize on how to utilize the whitening unit.

Best Snow Teeth Whitening Kit To Buy For Students

Best Snow Teeth Whitening  Kit To Buy For StudentsBest Snow Teeth Whitening Kit To Buy For Students

It doesn’t stay up to some of its commitments, however it is actually still a worthwhile assets if you are actually appearing for whiter pearly whites, and also is actually far better than a lot of other whitening items on the market. The Powder snow is fairly straightforward to use. Brush your teeth just before you start. Administer the product to your teeth carefully, being sure you get back at insurance coverage.

After 10-30 moments, eliminate the rack as well as rinse your pearly whites. Replay this method over the following days and also weeks. This process resembles some other whitening products. But the cream and also LED light direct exposure create it different than many various other bits as well as trays. However various does not consistently mean much better.

Teeth were noticeably whiter after a few days of making use of. And also with stretched use, there was significant progress. Yellow teeth, although not snowfall white colored, were significantly whiter. It took a bit longer than Snow assures, yet the device carries out ship outcomes fairly quickly.

Let’s encounter it. Some of the very most habit forming drinks and also habits are certainly not the very best for our teeths. Thankfully, if you really want white pearly whites, you do not need to leave to coffee, soda, sweets, herbal tea, wine, and cigarette smoking since there are actually a lot of teeth whitening kits to decide on (our experts still recommend that you kick the cigarette smoking routine for evident reasons). Pearly white whitening is actually a $ 3.2 billion around the world industry.

Best Snow Teeth Whitening Kit To Buy For Students

Thankfully, if you desire to spare cash, there are several efficient packages that you may use at home. There are practically pair of sorts of packages: ones that bleach your pearly whites to take discolorations off as well as ones that actually remove the spots. Switched on charcoal powders have come to be rather popular in recent times.

Whitening trays and bits have actually been the standard for years as well as usually depend on carbamide or hydrogen peroxide. There is actually a third form of teeth whitening product that merely blasts your teeth along with LED illumination. Having said that, experts spoken with through the Wirecutter state any gains from this procedure are short-lived. Only the SmileDirectClub device in our resource utilizes this innovation, yet it is used in conjunction along with a whitening gel.

Expectant or nursing ladies ought to certainly not make use of peroxide-based whitening items. It likewise isn’t suited for kids under 14 years of ages. Best Snow Teeth Whitening Kit To Buy For Students. As well as, you need to certainly not use peroxide for longer than two full weeks of everyday usage without the guidance of a dental expert. The FDA performs not highly recommend utilizing any whitening gels with a peroxide focus of greater than 18%.

You need to become careful making use of whitening products, as Customer Information details. For example, if your dark teeth result from the organic decreasing of pearly white polish that includes growing old, whitening sets will not help you. Also, they can not whiten dental fillings, dentures, laminates, crowns, or hats. Specialists state that whitening kits are risk-free when used as routed – Best Snow Teeth Whitening Kit To Buy For Students.

Best Snow Teeth Whitening Kit To Buy For Students

For that reason, regarding a week just before you start your whitening routine, make use of a tooth paste specifically made for folks with vulnerable teeth or even one that creates up polish. And also, avoid a day or even 2 of making use of if you perform experience sensitivity. The British Dental Diary has released brand-new investigation that points out there wants scientific documentation to confirm the cosmetic and also health and wellness advantages of activated charcoal tooth pastes and also powders, and that they may result in decay.

Best Snow Teeth Whitening Kit To Buy For Students

Best Snow Teeth Whitening Kit To Buy For Students

Snow is a leader on the property teeth whitening market. The proprietary whitening formula is complimented for having the capacity to wipe out also the toughest discolorations without triggering level of sensitivity. SHORTCUTSProfessional-quality teeth whitening at homeOver 500,000 delighted customersSuperior outcomes without inducing sensitivityHelps take out challenging coffee and also a glass of wine stains30-days refund guaranteeSnow makes teeth bleaching handy without any workplace check outs, uncomfortable strips, or cluttered request.

The Snowfall procedure is actually an LED-activated pearly whites whitening system that targets all sort of spots. This consists of those triggered through red wine, tea, coffee, and tobacco. The patent-pending light-accelerated innovation induces no adverse effects, as the insights are actually not damaging. It is actually FDA-approved, enamel-safe, and does not induce sensitivity. You do not need to have any sort of dental professional check outs or even prescriptions to perform the therapy from the comfort of your personal property.

Best Snow Teeth Whitening Kit  To Buy For StudentsBest Snow Teeth Whitening Kit To Buy For Students

Snowfall also declines to check on pets. There are actually pair of sets to decide on. The contents of each ought to last for over 90 treatments. Allow’s break what they contain as well as just how to choose the best one for you. This set is Snowfall’s best-known product, with the help of which they acquired their attraction.

The All-in-One kKt from Snowfall contains: a wired LED mouthpiece,3 whitening sticks,1 extra-strength whitening wand, anda shade guide. The mouthpiece is actually appropriate along with the Snowfall application, therefore you can regulate just how extremely you desire to whiten your teeth. Best Snow Teeth Whitening Kit To Buy For Students. It possesses a cable that lets you attach to USB, iPhones, and other smart devices.

Best Snow Teeth Whitening Kit To Buy For Students

It might be actually noticeable, however the biggest distinction in between the two kits is the wireless feature. Over three thousand were spent on r & d, creating brand new performances feasible. The contents of The Wireless Charging At-home Teeth Whitening Kit consist of: a wireless LED mouthpiece, a docking terminal,3 whitening sticks,1 maximum durability whitening stick,1 desensitizing cream, lip therapy, USB cord, andan user’s manual.

The final attribute enables the procedure to be actually changed to your necessities. It courses immediately, thus all you need to do is actually activate it on the app. The mouthpiece is water-resistant. This suggests you can safely use it in the downpour. What is actually additional, it cleans on its own while charging. There is likewise a red-light procedure alternative for your gums.

Depending on to research study, it helps: remove bacteria, lower pearly white sensitiveness, enhance blood stream flow in the gum tissues, protect against declining gum lines, boost bone thickness, andminimize post-whitening irritation. The docking terminal includes a hidden style, people typically contrast the technique it seeks to a bluetooth audio speaker. Besides sterilizing and demanding the mouth piece, it likewise functions as a penholder and traveling situation for your serum wands.

Effects are actually ensured to be obvious after 7 times of making use of. The kits are actually simple to use appropriate away from package, thus virtually any person may lighten their pearly whites with Snow items. Here is actually a general introduction: Safe forThose along with crowns, links, as well as veneersTeeth with fillingsPregnant womenBreastfeeding momsSensitive dentitionAdditionally, they deliver their items worldwide, so your site won’t restrict you.

Best Snow Teeth Whitening Kit To Buy For Students

It is actually encouraged that you clean and also floss your teeth before doing the treatment. Oral care helps get rid of any meals clutter and impurities (Best Snow Teeth Whitening Kit To Buy For Students). This permits also protection of the product. You yearn for all surface areas of your teeth to be actually brightened!Moreover, plaque and germs, which sometimes get caught in between the serum and the teeth, make it most likely for you to experience dental caries or even other oral concerns.

This step is certainly not required if your teeth does not ordinarily react to temperature level or even pleasant or even challenging foods. It certainly not merely reduces sensitiveness yet also builds up the pearly white enamel. The formula is also packed with minerals and also vitamins. If you decide to utilize the making less sensitive product, perform this 15 mins before the whitening session and also then rinse out.

Usage either the normal or extra-strength whitening cream, relying on the outcomes you desire. Spin the wand to receive the product out. You may possess to do this as much as 30 times when you first use it. The brush recommendation will assist you apply the cream. Visualize you are painting a white colored sentry fencing (Best Snow Teeth Whitening Kit To Buy For Students).

If you acquire it on your gum tissues clean it off the greatest you can. A tiny volume won’t injure, yet the product was created for pearly whites only. The wireless LED device has a “shake to wake up” feature. Listed below are the standard instructions for this feature: Shake the moment to switch it on.

Best Snow Teeth Whitening Kit To Buy For Students

A third opportunity for the gum treatment. Drinking it 4 times will definitely put it to sleep. You may likewise download and install the application to personalize your treatment. When you are actually done, position the light back in to the owner. If you have actually the wired mouthpiece rather, just link it as much as your phone to activate it.

Keep it in for 9 to thirty minutes daily, 21-30 days in a row. If you happen to experience some sensitiveness, take a 1 to 3-day breather as well as proceed the procedure later. It’s finest to conduct your treatments just before going to sleep. In this manner they do not hinder eating or even drinking.

The cordless kind will certainly self-sanitize while billing. Store your whitening sticks in the refrigerator after utilizing them. This can help all of them maintain their toughness over a longer period. The sets consist of a source for months of applications, so it’s a good suggestion to take the greatest achievable care of your items.

The body may be matched up to an expert therapy costing $500-$ 1,000. For a much lesser cost you may do this from the comfort of your very own property. You can easily order your Snowfall whitening package right on their web site, yet it’s also accessible on Amazon. Below is actually a summary of the amount of Snowfall whitening products presently expense: ProductPriceAll-in-one package$ 199Wireless billing kit$ 299Extra toughness refills$ 49Add-on for vulnerable teeth$ 25Serum refill wands$ 25There are actually also settlement choices for those that do not really want to be actually out the cash simultaneously – Best Snow Teeth Whitening Kit To Buy For Students.

Best Snow Teeth Whitening Kit To Buy For Students

Best Snow Teeth Whitening Kit  To Buy For StudentsBest Snow Teeth Whitening Kit To Buy For Students

This will definitely take place automatically and no costs will definitely be sent out, so you can simply appreciate your items. There is also a 30-day money-back promise and also a 5-year manufacturer’s warranty on electronic devices. It holds after you activate it on the Snowfall web site. SHORTCUTSProfessional-quality teeth whitening at homeOver 500,000 delighted customersSuperior end results without leading to sensitivityHelps remove challenging coffee and also a glass of wine stains30-days funds back promise Authorization Dental allows percentage from third-party firms.

After viewing social media flooded along with people going crazy regarding just how remarkable the Snowfall Teeth Whitening body is actually, I must learn. One that mixes all the most ideal items of teeth whitening and also neglects all the negative ones? Yeah, sure (Best Snow Teeth Whitening Kit To Buy For Students). If you are a strong follower that just about anything as well really good to be real is exactly that, listed below’s a teeth whitening unit to confirm you inappropriate.

Snow is actually also very budget friendly, at lower than 1/10th the rate of expert whitening at the dental professional. Also, Snow Pearly Whites Whitening does not lead to sensitiveness. You may possess your frozen yogurt and consume it also! Or is actually that pie? In either case, you may have each when your teeth may not be befalling coming from bursts of chemical therapies that white strips frequently consist of.

Truthfully,. The LED lighted mouthpiece increases the whitening from the gel on your pearly whites causing faster, longer long lasting as well as even more reliable whitening without resulting in sensitiveness. The LED lighting enables you to utilize Snow for a briefer time period with the exact same whitening affects matched up to other systems.

Best Snow Teeth Whitening Kit To Buy For Students

These are actually true, unpaid Snow clients’ reviews/before and after teeth whitening images undergone our company within the final one month. These are genuine, unpaid Snow clients’ reviews/before and after pearly whites whitening photos undergone our company within the final one month. Excellent item !! Just one that has actually functioned for me! And no sensitiveness!! AMAZING!! Purchase this sensation really skepitcal (Best Snow Teeth Whitening Kit To Buy For Students).

Best Snow Teeth Whitening Kit  To Buy For StudentsBest Snow Teeth Whitening Kit To Buy For Students

Passion it !!! Absolute best loan I have devoted on a doubtful item. Ultimately something that actually lives up to its own cases! I have actually been actually using this and would certainly encourage, I have actually observed a distinction after 4 days I adore this product! I have simply used it 3 opportunities user-friendly and also no level of sensitivity…, I also failed to remember to make use of the after item for the gums the very first 2 times! …

It does exactly what they mentioned it would certainly perform, yes to whatever!!!! I was actually pretty skeptical but I am actually quite pleased after 2 uses today. “The most effective teeth whitening system for sensitive pearly whites” “Take teeth whitening to the following confess an at-home kit that equals a browse through to your neighborhood pleasant dental expert.” “2 friends commented on how white my teeth looked after utilizing this package merely pair of times!”.

When you buy the Snow whitening device, you obtain the adhering to in every kit: Serum sticks LED holder Shade overview that assists you track your improvement Guidelines on exactly how to use the systemGetting began along with Snow is actually simple, and also the manual will definitely stroll you via whatever you need to have to recognize on just how to use the whitening unit.

Best Snow Teeth Whitening Kit To Buy For Students

Best Snow Teeth Whitening Kit  To Buy For StudentsBest Snow Teeth Whitening Kit To Buy For Students

It does not live up to a few of its own pledges, yet it’s still a practical investment if you’re looking for whiter teeth, and is much better than many other whitening items on the market. The Powder snow is actually relatively simple to utilize. Brush your pearly whites just before you start. Apply the serum to your pearly whites carefully, producing sure you receive also protection.

After 10-30 mins, take out the holder and also rinse off your pearly whites. Regular this procedure over the following times and weeks. This method is actually similar to a few other whitening products. But the lotion and also LED lightweight visibility produce it various than many various other strips and also trays. Yet various does not consistently indicate much better.

Pearly white were actually visibly whiter after just a few days of make use of. As well as with extended use, there was actually remarkable progress. Yellow teeth, although certainly not snowfall white colored, were actually visibly whiter. It took a little bit longer than Snow vows, yet the body does give end results reasonably swiftly.

Allow’s experience it. Some of one of the most addicting refreshments and also habits are not the very best for our teeths. Luckily, if you desire white colored teeth, you don’t must bid farewell to coffee, soda, sugary foods, herbal tea, wine, as well as smoking cigarettes due to the fact that there are numerous teeth whitening sets to decide on coming from (our company still advise that you kick the cigarette smoking routine for obvious main reasons). Teeth whitening is a $ 3.2 billion globally business.

Best Snow Teeth Whitening Kit To Buy For Students

Fortunately, if you wish to spare loan, there are actually many efficient packages that you can make use of at property. There are practically two sorts of kits: ones that bleach your teeth to take discolorations off and also ones that literally scratch off the blemishes. Switched on charcoal powders have become rather popular in latest years.

Whitening trays as well as strips have actually been actually the criterion for years and also generally rely upon carbamide or even hydrogen peroxide. There is a 3rd style of pearly whites whitening item that merely blasts your pearly whites with LED illumination. However, professionals questioned through the Wirecutter point out any sort of gains from this procedure are short-lived. Merely the SmileDirectClub unit in our resource utilizes this technology, however it is actually utilized together with a whitening gel.

Pregnant or nursing women should certainly not use peroxide-based whitening items. It likewise isn’t suitable for kids under 14 years old. Best Snow Teeth Whitening Kit To Buy For Students. And, you need to certainly not utilize peroxide for longer than 2 full weeks of regular make use of without the guidance of a dental professional. The FDA carries out certainly not recommend using any whitening gels along with a peroxide focus of more than 18%.

You need to be mindful utilizing whitening items, as Individual News clarifies. As an example, if your discolored pearly whites result from the natural thinning of tooth polish that comes along with getting older, whitening kits are going to not assist you. Also, they can not lighten dental fillings, dentures, laminates, dental crowns, or limits. Specialists claim that whitening kits are actually risk-free when made use of as directed – Best Snow Teeth Whitening Kit To Buy For Students.

Best Snow Teeth Whitening Kit To Buy For Students

As a result, about a full week just before you start your whitening regimen, use a toothpaste especially made for individuals along with delicate teeth or even one that constructs up polish. As well as, miss a time or 2 of utilization if you carry out experience sensitiveness. The English Dental Publication has actually released new research study that claims there wants clinical documentation to show the cosmetic and also health advantages of triggered charcoal toothpastes and grains, which they may cause tooth decay.