Benefits of dental whitening. There are several benefits to getting your dentist to do your whitening procedure. The first is the much quicker results that come with stronger methods. It’s also considerably safer and more comfortable because the mouthguards are personalized to every patient, ensuring it will fit your mouth properly. Moreover, professional whitening is more deep and thorough. While over-the-counter options can remove surface stains and improve the look of your teeth, dental-grade solutions can banish intrinsic staining as well.