My teeth have gotten a little dingy, so I’m on day 6 of the 10 day ‘classic’ whitestrips. It’s easy! It takes about a minute to put the gel-strips on, you keep them in your mouth for a half hour. Do this twice a day. I noticed a difference after the third day.

My teeth felt a little sensitive after day 4. The instructions say it will go away, and you can just do the strips once a day instead of twice a day if it’s painful. 6 years ago