I am looking for a tooth whitening product that won't hurt your teeth?!

I am looking for a tooth whitening product that won't hurt your teeth?

I used rembrandt and crest before and they hurt so much when you drink cold stuff.

All tooth whiteners will cause some sensitivity - before using them use a desensitizing toothpaste for a couple of weeks, e.g. Sensodyne. Use a high fluoride mouthwash as well (such as Oral B's Fluorinse) if you have sensitivity. Also the toothpaste can be rubbed into sensitive teeth a bit like an ointment and allowed to soak in overnight - don't be too generous with it just burnish it into the sensitive spots. Continue to use the Sensodyne for a few weeks after whitening.

If you find you are very sensitive then instead of using the product on a daily basis only use it every other day or every 2 days. It will take you longer to attain your desired degree of whiteness but it won't be as uncomfortable - continue with the desensitizing toothpaste during the days you are whitening.