We recommend consulting with your dentist before beginning any at-home teeth whitening treatment. Home treatments can carry minor risks if you have poor dental health, wear braces, have had recent oral surgery, or are allergic to peroxide.
Most people will experience a mild, transient gum/lip irritation if the gel is allowed on the gums/lips. An allergic reaction to peroxide can manifest as burning of the gums and/or blistering of the lips, whether or not the gel touches the soft mouth tissue. If this occurs, discontinue use immediately, rinse the irritated area well, and consult your dentist or physician if desired.