Whenever you purchase teeth whitening gel of any kind, whether for home or professional use, you should check the expiration date. Make sure you have enough time to use up all of the gel before it expires. Respectable teeth whitening manufacturers label their teeth whitening gel with the lot number and expiration date. At Beaming White, we label all products containing teeth whiten... https://beamingwhite.com/does-teeth-whitening-gel-expire/