Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Crest White Strips

  1. Jun 16, 2008 #1
    First of all the chemistry behind crest white strips, do they actually work?

    I have a package of Crest White Strips Premium plus my friend gave me from his work they have expired are they still effective after expiration date?
  2. jcsd
  3. Jun 16, 2008 #2


    User Avatar

    Staff: Mentor

    Check what active ingredient is - that's answer to both your questions :wink:

    Hydrogen peroxide is a strong oxidizer - so it may work. It is also unstable - so they can be not effective after expiration date, or at least less effective.
    Last edited by a moderator: Aug 13, 2013
  4. Sep 1, 2008 #3
    I would not use it after the expiration date.
  5. Sep 2, 2008 #4


    User Avatar
    Science Advisor
    Homework Helper

    Hydrogen peroxide decomposes at a fast rate in water, I would still use the product since these strips have Hydrogen Peroxide imbedded in something other than water, however they may not be a great as one which has not exceeded the expiration date. Observe the package , if it seems inflated , than it's probably no good.
  6. Jan 10, 2012 #5
    My mother swears by them, they definitely work... within the expiration date, at least.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Crest White Strips
  1. Grey and White tin (Replies: 6)

  2. White Gold (Replies: 5)

  3. White spirit (Replies: 2)