However, people usually dark colored teeth gradually with age due to absorption from food color. To return the color whiter teeth, use dental whitening techniques. The main active ingredient is Hydrogen Peroxide in medicine. The concentration of hydrogen peroxide in the standard bleach from 10% - 15% for bleaching techniques at home and 35% for teeth whitening techniques in dental clinics (under the activation of plasma or laser light). Also in bleach also have 1 buffer as flour additives to reduce bleaching sensitivity. There are two methods of whitening: whitening at home dental bleaching.
• Bleaching at home:
Your doctor will take your mark and make a plastic tray in 2 tight-fitting top and bottom teeth. The drug is added to tray, tray then take 2 hours per day. Said drug exposure becomes white after 2-3 days, however celery in 7 days to maintain tooth color is durable.
• Dental Bleaching at: