There are many over-the-counter teeth whitening options, and one type of readily accessible whitening product is commonly referred to as paint-on teeth whiteners. Paint-on whiteners can be purchased over the counter and are generally less expensive and less effective than whitening strips or professional options. Paint-on teeth whiteners consist of a gel that a user applies to the teeth using a small brush. Paint-on whitening gel hardens into a film that coats the treated teeth and dissolves in the mouth. As with any teeth whitening regimen, we recommend that you consult us before you begin treating discolored teeth.