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 is applied to the tooth using a small brush. Paint-on whitening gel hardens into a film that coats the treated tooth and dissolves in the mouth. As with any teeth whitening regimen, it is wise to consult with a dental professional before treating discolored teeth.