How easy is it to apply a paint-on teeth whitener?
Another criticism aimed at paint-on teeth whitening products has to do with their ease of use. The application of paint-on teeth whiteners, while seemingly easy, can be awkward. Drying teeth, applying the product, ensuring application of the whitener to the entire surface of each tooth can each be more of a challenge than one might expect. Our Date, 2003 reference evaluated user application of paint-on whitener. They added a blue dye to Crest Night Effects ® samples so they could determine the extent to which coverage of the front side of front teeth of each user was achieved. They determined that the study’s participants were able to accomplish 85% coverage. Clearly a tray-based teeth whitening system would achieve a greater degree of coverage.
