It is possible to use paint-on teeth whitener, available from drugstore brands like Crest and Colgate. To paint on whitening solution, an individual essentially applies a bleaching gel containing peroxide onto the surface of their teeth. It is applied using a small brush, and the gel forms an invisible film over the teeth.
Paint-on tooth whiteners are not considered as effective as other whitening methods, such as tray-based methods and even white strips. In order to attain results, a product must contain high concentrations and be used for a long period of time. The paint-on whiteners do not provide this. They are effective as a temporary solution only.