While some over the counter whitening products do work, we have found professional whitening products have proven to produce more predictable results. Many OTC whitening toothpastes work because they are more abrasive, which allows them to sand away surface stains. For some patients, this can cause sensitivity or root abrasion. If you are interested in whitening, talk to Dr. Chandler about whitening trays. They are specially made to fit your teeth for noticeable, comfortable, and safe results.