Do not use if you: are pregnant/nursing, have poor dental health (decaying teeth, exposed roots, gum disease), wear braces, had recent oral surgery, or are allergic to peroxide. 

At-home teeth whitening is not recommended for those individuals who have newly erupted teeth or for children under 14 years of age.

At-home treatments carry minor risks, and you should consult your dentist. Some people will experience reversible minor tooth sensitivity or gum irritation. This will disappear: 1) within a few days after discontinuing use; or 2) by decreasing the length of your bleaching sessions; or 3) by increasing the amount of time between teeth whitening sessions; or 4) by using the Remineralizing Gel more often.