Teeth whitening strips - Common side effects and how to manage them.

- Thermal sensitivity. | Gum irritation. | Treatment and remedies. | Ways to prevent and control side effects.

Dealing with side effects caused by whitening strips.

a) Common problems.

By far, the two most common side effects people experience when using a whitening strip product (like Crest Whitestrips®) are: 1) Tooth sensitivity  and  2) Gum irritation. This page outlines remedies for both of these complications. A less frequent side effect is throat irritation/sore throat.

(Sometimes people notice uneven whitening or white spots on their teeth after treatments. We discuss these issues here.)

b) Side effect avoidance.

You can minimize your risk for side effects, or get them under control more quickly once they start to appear, by following some basic guidelines. The lower portion of this page explains how.

1) Tooth sensitivity.

Studies suggest that between 1/3 and 1/2 of all people who use Crest Whitestrips® will experience some degree of tooth sensitivity. This is on par with that level typically reported for other peroxide-based whitening methods.


Whitestrips Supreme have the highest concentration whitener.

Crest Whitestrips Supreme.

Using a lower concentration strip can help to reduce side effects.

a) Why does it occur?

The cause of the sensitivity is no doubt multifactorial. But one major aspect has to do with irritation (inflammation) of the tooth's nerve by the strip's peroxide whitener.

In general, the more concentrated the whitener, the more likely it is that this effect will occur. (So, if you're searching for the "strongest" or "quickest working" strip, you may be setting yourself up for a fall.)

b) What's the pain like?

In most cases, the sensitivity that's noticed is a heightened reaction of your teeth to hot and cold items, such as foods and beverages. Dentists call this "thermal sensitivity."

How much pain can you expect?

Since strips whitening typically involves the use of a relatively low concentration whitener, the sensitivity they cause usually comes on gradually. It may increase with each treatment, or just be noticeable for those first few hours following a bleaching session.

Since the sensitivity is usually relatively minor, and setting it off fairly easy to avoid, it typically doesn't cause great disruption in a person's life. Or even interfere with their bleaching schedule.

c) Tooth sensitivity - Remedies.

1) Some improvement should occur naturally.

In the majority of cases, a person should notice that their thermal sensitivity begins to fade, a little each day, once they have completed their bleaching treatments.

Performing whitening sessions less frequently or using a lower concentration product (such as Whitestrips® Gentle Routine) can help to speed this process along. - More information.

Toothpaste 'for sensitive teeth' can often cure tooth sensitivity side effects caused by teeth whitening strips.

Using desensitizing toothpaste, before or after problems occur, can help.

2) Try using desensitizing toothpaste.

You may be able to control the level of sensitivity that you experience by using an over-the-counter anti-sensitivity (desensitizing) toothpaste.

Many manufacturers make an anti-sensitivity version of their regular paste. These products are often labeled with the phrase "toothpaste for sensitive teeth." Their active ingredient is frequently potassium nitrate or fluoride.

(Related page: The best toothpastes for treating tooth sensitivity.)

Additional product selections are shown at the bottom of this page.

Relief may take some time. - The idea is that you use the toothpaste in place of your regular one, for some days and weeks, as it gradually produces its effect.

(Prescription-strength fluoride toothpaste or gel prescribed or dispensed by your dentist can also be used in a similar fashion.)

3) Preventing tooth sensitivity.

As a way of helping their patients reduce their risk for experiencing thermal irritation, many dentists recommend that they begin using a desensitizing toothpaste two weeks prior to initiating the use of their whitening strips.

2) Gum irritation.

Studies suggest that between 1/3 and 1/2 of all people who use Whitestrips® will notice some degree of gum tissue irritation.

a) Why does it occur?

Gum irritation is caused by the caustic nature of the peroxide found in a strip's whitener. In general, the higher its concentration, the greater the likelihood that this side effect will be noticed. (Once again, a reason why the "strongest" or "quickest working" type of strip doesn't likely make the best choice.)

Teeth-whitening strips can cause gum irritation.

The cause of whitening strip gum irritation.

1) The fit of the strips is part of the problem.

Unlike the scalloped shape of a person's gum line, the edges of a whitening strip are relatively straight.

And this means that when a strip is positioned over the user's teeth, some of its full-strength whitener will be in direct contact with their gums.

2) Residual whitener can be the cause too.

Gum irritation can also result from deposits of whitener that are left behind after a whitening strip has been removed.

For this reason, you should always rinse, wipe and/or brush your teeth and surrounding gum tissue after every bleaching treatment. Be sure to wash your hands and toothbrush off afterward.

b) How much discomfort can you expect?

In most cases, the level of gum irritation that a person experiences is just mild. It usually doesn't interfere with their daily activities, or even their bleaching schedule.

c) Remedies for gum irritation.

In the typical case, whitening strip gum irritation will gradually disappear over the next few days after the person's bleaching treatments have been completed. Performing sessions less frequently or using a lower concentration strip product (Crest Whitestrips® Gentle Routine) can help to keep this side effect in check. - More information.

d) The whitener may irritate your fingers.

Besides just your gums, a strip's whitener can also irritate your skin. We discuss this phenomenon in greater detail here.

3) Throat irritation.

Just like with any peroxide-based system, if the whitener from a strip is swallowed, throat irritation may occur.

Preventing sore-throat side effects.

As a general rule of thumb, anything foreign that's placed in your mouth will tend to trigger increased salivation. So when strips are worn, especially during your first several sessions, you may notice this effect.

Of course this saliva will contain some peroxide whitener that has leached from your strips. So the solution is to avoid swallowing this fluid, at least to the extent that's possible. Instead, always spit out.

You will of course still end up swallowing some peroxide. But if you can keep this to just a minimal amount, the hope is that it won't be enough to cause irritation.

How using strips can help to lower your potential for sore throats.

With whitening strips, a very precise amount of peroxide is placed on each one. That's opposed to bleaching systems where the user dispenses the amount of whitener that's used during each treatment.

That means if you've chosen to use a standard strips kit (meaning one that doesn't have a high peroxide concentration, like the WhiteStrips® Classic or Gentle Routine products), with just a little precaution it's unlikely that your throat will be exposed to enough peroxide to cause any soreness.

Remedies for whitener-induced sore throats.

If the source of your throat soreness is the simple cause and effect we describe above, you'll usually find that your condition is self-limiting (which means that as hours pass you should notice ever decreasing irritation).

And as mentioned above, if experiencing this side effect becomes a reoccurring issue for you, you can probably lower your risk by choosing a kit that comes with lower-concentration strips. Wearing your strips less frequently (like every other day) may help too.

Also, be sure to remove any residual whitener from your teeth after treatments (using a wet tooth brush is a good method) and rinse out thoroughly.

3) Guidelines for managing side effects.

a) If you notice side effects, stop your whitening treatments.

If side effects start to show up, it only makes sense to stop performing whitening treatments (right now, immediately).

There's absolutely no reason not to.

Bleaching teeth with peroxide is simply a function of whitener concentration and total treatment time (session length X number of sessions).

Interrupting the process for a few days, as you evaluate your side effects and allow them to subside, will not compromise your results (assuming that at some point you are finally able to finish using all of your strips).

b) Re-evaluate your whitening approach.

Once your side effects have subsided, you'll need to make a decision. Should you resume your treatments, or have the side effects you've experienced put you off on the whole idea of whitening your teeth.

If you do decide to continue on, you now have experience with what doesn't work. So, what you need to do is come up with a plan that can help to reduce the chances that your side effects will return.

Crest Whitestrips.

One pair Crest Whitestrips (upper/lower).

1) Try using your whitening strips less frequently.

One plan that can be successful is to continue on with the use of your strips but perform treatment sessions less frequently.

You'll simply have to experiment to see what regimen works best. For example, if wearing them every other day still triggers side effects, try every 3rd day. Or whiten on consecutive days until symptoms start to occur, and then back off on treatments for a while.

And don't worry, as we discussed above, performing sessions less frequently won't interfere with the bleaching process, it will only slow it down. Assuming you still use all of your strips, you'll reach the same lightening endpoint.

2) Try using a lower-concentration strip.

Another solution involves using strips that are coated with a lower concentration whitener. For example, instead of using one of Crest®'s standard 10% hydrogen peroxide strips, try using their 6% one (Crest Whitestrips® Gentle Routine).

Different than above however, by using a lower concentration strip your total exposure to the whitening agent will likely be less. If so, you'll achieve less whitening success.

3) Which approach is better?

To get a relative idea of which approach might be best for you, simply do some calculations. For example:

  • Crest Whitestrips® Professional Effects (10% hydrogen peroxide whitener, 30 minute application, 20 sessions) - 10 hours of total exposure of a 10% product.
  • Crest Whitestrips® Gentle Routine (6% hydrogen peroxide whitener, 5 minute application, 28 sessions) - 2.3 hours of total exposure of a (roughly half as strong) 6% product.

Clearly these two products couldn't possibly be expected to produce the same whitening outcome. In the case where side effects are a problem for you:

  • If your teeth just need a little improvement, the Whitestrips® Gentle Routine product would probably make a good choice.
  • If your teeth need a lot of improvement, you might either use Whitestrips® Professional Effects but spread out over a longer time frame. Or consider ultimately using more than one box of the Gentle Routine strips.
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4) Gauging your risk for side effects.

Start out slowly.

A smart way to test your potential for experiencing side effects is simply to ease into the use of your strips.

For example, if their directions recommend daily treatments, do an initial one and then skip a day. If you notice even a hint of side effects, continue on with this routine (or less) as you figure out what degree of problems you're going to experience.

Faster and whiter isn't better.

If you're trying out teeth whitening strips for the first time, choosing a product that boasts that it gives faster and brighter results may not make the best choice, at least in terms of avoiding side effects.

These types of products tend to be ones that have a higher concentration whitener, or are intended to be worn for extended time periods (possibly even an hour or more). Neither of these characteristics lend themselves to preventing side effects. When choosing, just look for a standard "introductory" type product made by a well known manufacturer.



Topic Menu ▶  Using Teeth Whitening Strips


Crest Whitestrips

I found this very helpful I'm glad you had this for me to read I was starting to get very concerned with my irritation in my gums after using this product. Now I will continue to use it every other day. thank you

Sore throat

I only did the treatment once..and woke up to a burned out mouth...my taste buds feel burned..my throat is sore...I don't know how to fix it and feel better.


We're under the impression that this phone number 1-800-492-7378 can be used to contact Procter & Gamble about difficulties experienced with their Whitestrips products.

From your post it's unclear exactly what has transpired.

If you've fallen asleep during your treatment, it would seem that while sleeping you've instinctively swallowed your saliva that contains the Whitestrips peroxide whitener, thus causing your sore throat. If you've slept for longer than the recommended treatment time, it would seem your whole mouth has had too much exposure to the peroxide, thus creating its irritation.

With this scenario, it would be expected that the irritation would be self-limiting (fade away as time passes). An oral analgesic (like Chloraseptic) might help to keep your mouth and throat more comfortable during that wait.

If it's the situation where you had completed your treatment before going to bed, possibly some amount of residual whitener remained on your teeth, thus causing the irritation you noticed.

While less uncommon, the situation could exist where you personally have a reaction to the compounds in the strips and therefore cannot use them. The Proctor & Gamble phone number above might shed some light on this possibility. We advise you to contact your dentist or doctor for an appropriate plan of treatment and subsequent evaluation.

Teeth Whitening Strip

Thanks for this huge information. This is actually very helpful for people using teeth whitening strip.

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