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Yes they do. I have listerine whitening strips that are expired. There should be something on the box.

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16y ago

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Related Questions

Can whitening strips whiten naturally yellow teeth?

considering whitening strips contain chemicals there is nothing natural about them.


Can you smoke after using whiteing strips?

It is recommended to avoid smoking after using whitening strips as smoking can stain teeth and counteract the whitening effects. It is best to wait at least 24 hours after using whitening strips before smoking to maximize the results.


What are whitening strips made of?

They are made out of mint


What are the ingredients in the Crest Whitening Strips?

Crest Whitening Strips are used as a popular alternative for whitening teeth. The ingredients include: Water, Glycerine, Hydrogen Peroxide, Carbon 956, Sodium Hydroxide and Sodium Saccharine.


Can you close your mouth when you have whitening strips on your teeth?

Yes, you can.


How long before crest white strips expire?

All products over the counter MUST have an expiration date on the box. It is mandatory by the FDA. Usually any whitening system lasts up to 12 months.


Is Arm and Hammer whitening booster better than whitening strips?

I like Crest Whitestrips Seals better


How much do whitening strips cost?

About 20 dollars to 40 dollars


Is it ok to wear whitening strips under the age of 12?

I don't think this is ok, girls at that age are young enough to improve their teeth and using whitening strips isn't a good habit to start.


What do you do after you take the whitening strips off?

After you remove the teeth whitening strips there will be excess residue on your teeth left over form the gel from the whitening strips. As the whitening gel gets to work it foams up (which is the oxidation process that whitens your teeth) so it will spread out across your teeth. The best thing to do is to gently brush away the gel from your teeth using a soft toothbrush and your normal daily toothpaste - this will remove the left over whitening gel and freshen up your mouth.


Is there anything that can clean teeth better than teeth whitening strips?

Yes, a toothbrush and toothpaste. The strips are not made for cleaning.


What different options are available for a person interested in dental whitening services?

The several different options available for those to undergo teeth whitening are, whitening strips, bleaching, professional laser whitening, gels and surgical scrape and clean.