"If it's causing you more stress than it's worth... it's not worth it." - Yellow
Question #23162 posted on 02/20/2006 3:01 a.m.

Dear 100 Hour Board,

I have been using Crest Whitestrips for two days now. If any of you have used them, how long does it take to start seeing a change in your tooth color?

- I Hope These Work

A: Dear I Hope,

I started seeing a difference right away...like 24 hours. I had to stop using them because my teeth were so white. Good luck!

-la bamba
A: Dear They Will:

It took me about three days to notice results. I too cut my time short, and plan on using the second half of my box soon.