Professional Dental Bleaching Systems provide the most comfortable and effective form of at-home dental bleaching. These are the systems that are provided by virtually every professional dental office for at-home whitening.  Precision trays are created at a dental lab using impressions of your teeth easily made at home.  These impressions are then forwarded to a dental lab so that mouthpieces can be created and forwarded back to the patient. Precision mouthpieces are comfortable to wear and minimize gum sensitivities. Professional systems promote a uniform whitening of teeth with minimal usage of whitening gel and are the most comfortable at-home dental bleaching trays available, but are 3-5 times more expensive than thermoform trays. Professional systems usually contain active ingredient of 10% - 22% Carbamide Peroxide.