useful food

Some foods protect against cavities because they naturally contain fluorine, from which fluoride is derived.[19] Fluoride occurs naturally in water. Water fluoridation is the addition of fluoride to adjust the natural concentration of fluoride in water supplied to a community to the level recommended for optimal dental health, approximately ppm. ppm is equivalent to 1 mg/litre.[20] Fluoride is the number one protector against tooth decay. Fluoride makes tooth surfaces more resistant to acids during the re-calcification process. Drinking fluoridated water is recommended by some dentists, while others say using toothpaste alone is sufficient. Milk and cheese are also rich in calcium and phosphate, which support the re-calcification process. All foods increase saliva production, and since saliva contains buffering chemicals it helps stabilize the pH near 7 (equivalent) in the mouth. Foods rich in fiber help increase salivary flow, and a large piece of fiber such as a slice of celery can push saliva into food stuck in the cracks of the teeth where 80% of cavities occur, or to reduce the concentration of carbohydrates such as sugar, neutralizing acids and retarding teeth.