In addition to becoming Amazon’s No. 1 bestselling teeth whitening strips, Crest 3D Whitestrips Professional Effects have ...

(CNN) -- Hydrogen peroxide, the active ingredient in over-the-counter whitening strips, may be harmful to the layer under the enamel of teeth, according to research presented Tuesday at a ...

Hydrogen peroxide, the active ingredient in over-the-counter whitening strips, may be harmful to the layer under the enamel of teeth, according to research presented Tuesday at a scientific meeting.

These strips contain hydrogen peroxide to help reduce staining and brighten teeth. Just pull the backing off a strip, apply it over your top and bottom teeth and keep it in place for 30 minutes.

They work by breaking down stains with chemicals such as hydrogen peroxide, which has been proven to whiten teeth. Some strips can get beneath the enamel to reduce or remove deeper stains as well.

Hydrogen peroxide, the active ingredient in over-the-counter whitening strips, may be harmful to the layer under the enamel of teeth, according to research presented Tuesday at a scientific meeting.

Hydrogen peroxide, the active ingredient in over-the-counter whitening strips, may be harmful to the layer under the enamel of teeth, according to research presented Tuesday at a scientific meeting.