Q: What is a sealant?
A: A sealant is a plastic material a dentist usually applies to the chewing surfaces of the permanent back teeth — the molars — to prevent cavities. Those teeth, which are designed for crushing and chewing, have an uneven terrain of pits and fissures. They’re good for what they do, but they are susceptible to cavities. In this painless procedure, the dentist will thoroughly dry the teeth, then apply a layer of an acidic liquid that will etch the tooth slightly. Over that, he/she will apply the liquid plastic that will flow into the depressions of the teeth and harden.
The protective coating keeps out the plaque and acid that cause decay. Sealants are used most effectively with children who have newly formed permanent teeth. The American Dental Association says sealants are virtually 100 percent effective in preventing tooth decay where they are applied.
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While tooth enamel is the hardest element in your body, it is susceptible to wear and tear just like any other part of the body. Some foods and beverages that passes through our mouth are more corrosive to enamel than are others. For instance, though fruit and fruit juice are good for us in some ways, those that contain citric acid, like oranges, lemons, and grapefruits, are potentially damaging to teeth enamel. You should also consume carbonated drinks in moderation. In addition, you even also need to be careful about the toothpaste you use. You should avoid toothpastes with abrasives in them, like charcoal toothpastes, even though they may be marketed as tooth-whitening, stain-removing marvels.
Acids in sugar-free beverages can erode tooth enamel. People find carbonated beverages refreshing. Enjoy them in moderation and preferably with meals. The American Dental Association offers these tips to reduce tooth erosion from acidic food and beverages:
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Acidic foods and beverages can wear away the enamel that protects teeth, a process known as tooth erosion. Tooth erosion is permanent and may open the door for bacteria to cause cavities or infection. It can also make teeth appear discolored, as white enamel is worn away to expose the yellow layer below called dentin.
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The foods we eat on a regular basis influence the makeup of the bacteria — both good and bad — in our mouths. While it well known that sugary foods contribute to tooth decay, researchers are finding that they also play a large role in periodontal disease as well as overall systemic health. 
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Q: How can I keep my teeth for my entire lifetime?