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Brushing regularly with a remineralizing toothpaste is one of the best methods of strengthening tooth enamel. Luckily, most toothpastes contain the fluoride to do this.

Tooth enamel is the hardest tissue in the body. Problem is, it's not living tissue, so it can't be naturally regenerated. Unfortunately, you can't regrow it artificially, either not even with those special toothpastes. They push calcium and phosphates back into the tooth, and it hardens the enamel."

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Drink more water throughout the day if you have low saliva volume or dry mouth. Use fluoride toothpaste. Fluoride strengthens teeth, so make sure fluoride is listed as an ingredient in your toothpaste. Ask your dentist if sealants may be helpful in preventing enamel erosion and tooth decay.

One problem with the four-stroke design is that the crankshaft is being powered by the cylinder for only one stage out of four. That's why cars typically have at least four cylinders, arranged so they fire out of step with one another. At any moment, one cylinder is always going through each one of the four stages—so there is always one cylind