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 agoWiki 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.
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.
No you can't unless you start the event again.
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.
If it has expired you cannot use it.
no it is not .if you drive with a expired license you are breaking the law
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.
can you??
No. It has expired.No. It has expired.No. It has expired.No. It has expired.
no
Yes
No you can't use expired Noni juice.
No.