Whitening strips ?

I purchased some whitening strips off the internet and the mail man put them in my mail box and they were out there for around 3 hours . The issue is , is that it was 90 degrees today . Are the still safe to use ? They are the crest brand

Submitted July 01, 2015 at 04:16PM by PROVERBIALLEMONADE http://ift.tt/1Hy4K8z