The procedure can be applied on each tooth to get a whiter 4-8 shade in a short time under hygienic circumstances. If the teeth are too damaged and have deep stains, the procedure takes about 1-2 hours. For teeth whitening, hydrogen peroxide and carbonic acid peroxide which consist of oxygen-derived chemicals are used. They are normally harmless unless they come into contact with the gums of the patient and damage them, especially during longstanding procedures.
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