Bleaching

see Whitening. like Bleaching trays.
The different forms of dental bleaching
Whitening toothpastes: These are over-the-counter preparations that have a low concentration of carbamide peroxide. These toothpastes will work to brighten your teeth if you are a very good brusher, brush many times a day, and have a lot of patience. In the years since these toothpastes have been on the market, I have seen only one person who achieved real results using whitening toothpaste only. They are very useful, however in maintaining the whitening achieved by using trays and strips.
Bleach releasing disposable strips (Crest Whitestrips): These are strips of plastic dentures designed so that they will adhere to the teeth. They are applied and worn for several hours like the trays described above. The carbamide concentration in home bleaching strips is only 7% to 14% while professionally prescribed take-home bleaches come in either 22% or 32%. Thus it takes a lot longer to get the same results using over the counter bleaching strips than it does using professionally prescribed bleaching solutions in trays. The main advantages to the strips is that no impressions need to be taken to make trays, and the strips do not apply pressure to the teeth which may increase the sensitivity of the bleaching process. A number of my patients have tried them. Some have had good results. The major problems I have heard about with the strips is that they do not adhere very well to lower teeth, and they are too short to bleach all the upper teeth that show when the patient smiles.