Teeth whitening done by your dentist can get teeth brighter faster. The bleaching solution is usually much stronger than at-home kits. Also, heat, light, or a combination of the two may be used to speed and intensify the whitening process.
The most dramatic results — teeth generally get three to eight shades brighter — usually take several 30- to 60-minute in-office visits. Some dentists use techniques that can be done in a single 2-hour appointment (e.g. the Zoom system).
There are many choices for bleaching teeth at home, the most common include:
Tooth whitening strips and gels. Applied directly to the teeth with a brush or a thin strip, these peroxide-based tooth bleaching products usually need to be applied once or twice a day for 10 to 14 days. Results last four or more months.
Tray-based tooth bleaching systems. With this teeth whitening option, a mouth guard-like tray is filled with a peroxide-based bleaching gel or paste and placed over the teeth for one to several hours a day for up to four weeks. You can buy tray-based tooth whitening systems over-the-counter or have one custom-fitted by your dentist.
Tooth whitening toothpastes. Because they’re mildly abrasive, every toothpaste helps remove stains from teeth. Whitening toothpastes, however, also contain chemicals or polishing agents that help scrub stains from teeth without the aid of a bleaching agent. Tooth-whitening toothpastes are relatively inexpensive and brighten teeth by about one shade. Some whitening toothpastes contain peroxides, but they aren’t left on the teeth long enough to have a whitening benefit.
Whether you use an at-home tooth-whitening system, or have your teeth bleached by a dentist, you can help maintain the results by brushing, flossing, and rinsing daily. Also, avoid acidic and tannin-rich foods and beverages such as:
Black teas and coffee
White and red wine
Carbonated beverages (dark and light-colored sodas)
Berries and other strongly-colored foods
Sauces (soy, tomato, curries)
Tooth bleaching can make teeth temporarily sensitive — or be uncomfortable for people who already have sensitive teeth. When used incorrectly, home kits can also lead to burned — even temporarily bleached — gums.
Tooth-whitening works best for people with yellow teeth and is less effective for people with brown teeth. If your teeth are gray or purple, tooth bleaching probably won’t work at all.
To be sure tooth-whitening is worth your time and money, talk to your dentist before you use an over-the-counter tooth whitening kit.
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