20 Things That Can Ruin Your Smile (Part 3)
Candy
"Naturally occurring bacteria in the mouth devour sugar, creating acids that attack tooth enamel, which can lead to decay and a host of other problems, including gingivitis and cavities," says Halpern.
The worst thing you can do is leave sugar lingering on your teeth and gums. Eating any amount of candy and brushing and flossing immediately is actually less damaging than not brushing after eating one piece before bedtime, says Halpern.
If you can't brush after a snack attack, eat cheese or yogurt, or chew sugarless gum to boost saliva flow and neutralize acids.
Puberty
The hormonal surge that occurs during puberty can cause more than acne—it can also result in swollen gums that are more sensitive to plaque. This can lead to gum infections, gingivitis, and mouth sores, say Halpern. 
"But typically the gums only respond in such a manner if hygiene care is poor," he adds. Make sure your teen brushes and flosses daily, and sees a dentist regularly.
Dry mouth
A dry mouth isn't just unpleasant, it's bad for your teeth. Saliva washes away cavity-causing bacteria and neutralizes harmful acids. "Without saliva, you would lose your teeth much faster—it helps prevent tooth decay and other oral health problems," says Meinecke.
Drink lots of water, chew sugarless gum, use a fluoride toothpaste or rinse, and consider over-the-counter artificial saliva substitutes. See your doctor if it's a frequent problem.
Dieting
Restrictive diets and poor eating habits can deprive you of the vitamins and nutrients necessary for a beautiful smile.It's especially important to get enough folate, B vitamins, protein, calcium, and vitamin C—all of which are considered essential for healthy teeth and gums.
"Poor nutrition can affect your entire immune system, increasing your susceptibility to many disorders and infections, including periodontal disease," says Halpern.
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