Teeth can be protected from acid attacks by removing plaque, reducing the number of times and the amount of sugar and starches eaten, using fluorides, having plastic sealants applied to teeth, and by regular professional cleaning of teeth by a dental hygienist.   [less]

Plaque, a thin, colorless, sticky film containing bacteria, which constantly forms on the teeth. These bacteria use carbohydrates—sugars and starches—to produce an acid that attacks the enamel covering the teeth. After repeated acid attacks, the enamel can be broken down and a cavity begins. Continued acid attacks eventually dissolve the enamel and penetrate the softer, inner layer of the tooth, where decay can spread rapidly throughout the tooth’s structure. Acid attacks begin immediately after every meal or snack and last about 20 to 30 minutes.  [less]

The most common causes of tooth loss are dental caries, also known as tooth decay, and periodontal disease, which affects the gums and bone structure that supports the teeth. Dental caries is the major cause of tooth loss in children, and periodontal disease is the major cause of tooth loss in adults; however, it too can afflict youngsters.  [less]

No they do not. But, you will get more esthetic appeal from using a natual colored amalgam that compliments your smile.

Gold crowns last the longest.