You can’t predict how sensitive you’ll be
It’s impossible to predict the degree of sensitivity and pain, if any, you’ll feel after whitening treatment. Some treatments include a desensitizing gel like amorphous calcium phosphate (ACP), which may help when you apply it before or after whitening, or your dentist may recommend ibuprofen before or after a treatment. Even a desensitizing toothpaste containing fluoride, or a fluoride mouth rinse, may make a difference: “Fluoride is a very good tooth desensitizer,” dentist Bruce Ward says. If you’re having trouble with a take-home kit, try taking a two- or three-day break before continuing, or apply the whitener for half the time period that’s directed. If you decide to grit your teeth and bear it, remember the discomfort tends to be temporary.