The action of chewing sugar-free gum has the advantage of sustaining saliva flow at high levels over a long period of time. Eating non-citrus fruits, vegetables and cheese after a meal can also increase saliva flow. Two critically important vitamins for the maintenance of healthy teeth and gums are Vitamin C and Vitamin D. Vitamin C not only helps build resistance to infection but is extremely important in the process of maintaining healthy teeth, gum and bones. A deficiency in Vitamin C can lead to scurvy, bleeding gums and tooth decay. Good sources of Vitamin C can be found in raw cabbage, carrots, orange juice, lettuce, celery, onions, tomatoes, and all citrus fruits.
Vitamin D is essential for the development of bones and teeth.
A deficiency in Vitamin D can lead to rickets and tooth decay. It is essential in the metabolism of calcium and phosphorus, two of the most important minerals in forming bones and teeth. Vitamin D is manufactured in the skin with exposure to sunlight and can be found in milk, cod liver oil, salmon and egg yolks. There are numerous factors to consider in regard to the darkening of teeth and there are as many explanations. A good place to begin is with the use of tobacco along with certain foods and drinks.