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"You will see results usually in less than an hour," says Just Whiter Teeth , maker of at-home whitening products. "Get four to eight shades whiter with consecutive use." If you’re tempted to buy a whitening kit at your local pharmacy or big-box store, beware: teeth-whitening products come in various strengths. While many 20- to 30-minute trays or strips whiten using hydrogen peroxide products, the concentration of those products can vary between 40 and only 3 percent. Make sure you know what you’re buying before you whiten on your own. Unlike a diamond, your pearly whites aren’t forever — unless you’re consistent with your whitening regime. Results from at-home teeth whitening can last about six months to one year, according to Cleaner Smile . Depending on your lifestyle, your results could vary. For example, if you smoke or drink coffee, tea, red wine or soda, you may need to whiten your teeth more often. Just because you spend hundreds at your dentist’s office doesn’t mean your results will last longer.
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