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Not nearly as well. The active ingredient is hydrogen peroxide. It degrades to water and oxygen over time. After expiration, there is still active ingredient, but, depending on long they've been expired, the effect is diminished.
http://www.3dwhite.com/teeth-whitening/3d-white-faq.aspx
Wiki User
∙ 13y ago
Wiki User
∙ 17y agoYes, they do. Anecdotal evidence: I've noticed a definite improvement, but it only lasts a few months. I asked my dentist recently about all these new strip whiteners and he said they were extremely hard on the gums! So beware! Ask your dentist before using them and you dentist can brighten you smile more safely.
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Can you use crest 3d white to get rid of acne?
In my own opinion I think it works. My teeth have become whiter in the last 2 weeks. I think you have to read the directions on the bottle to get the true results. I actually think this is my favorite toothpaste I have ever had because even after 30-60 minutes my mouth still feels minty fresh.
Can you still get the liberty pass for Pokemon Black and White?
No you can't unless you start the event again.
Can you still use an expired postal order?
If it has expired you cannot use it.
What is the most effective way to whiten your teeth if you have deteriorating gums on your front bottom teeth and can you still use white strips?
I would suggest going to the dentist. Those white strips can cause further irritation. They aren't recommended for people with gum or other oral issues.
Is an expired license still valid?
no it is not .if you drive with a expired license you are breaking the law
Can you still use a moisturizer if it is expired?
can you??
Is an expired Ca Id still Id?
If it was still good, it wouldn't have an expiration date. If the ID expired, you need to renew it for it to be valid.
Is a promissory note still due if no payments were made on it and the time to make all payments has expired?
No. It has expired.No. It has expired.No. It has expired.No. It has expired.
Will you still be a Super Moshi when your membership has expired?
no
Do expired laxatives still work?
Yes
Can you still use expired Noni Juice exp 81707?
No you can't use expired Noni juice.
Is a NicoDerm CQ patch still good if it is expired?
No.
