In 1981, Reagan persuaded Congress to reduce the top tax rate form 70% to 50% and to index tax brackets (so that inflation was taken into consideration). In 1986, the Tax Reform Act reduced the rate on the wealthiest Americans to 28%.
Causes. Cavities are caused by tooth decay â a process that occurs over time. Here's how tooth decay develops: 1  Plaque forms. 2  Your mouth naturally contains many types of bacteria. 3  Some thrive on food and drinks that contain certain forms of sugar.
Everyone knows that sugar causes cavities, but few people realize that diabetes may increase sugar presence in the oral cavity, which may lead to dental caries (cavities). Severe periodontal disease may increase blood sugar, leading to longer periods of time when the body must function with high blood glucose.