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.
Cavities are also known as tooth decay or caries. Anyone with teeth can get a cavity. They are most common in small children,... Dental cavities are permanently damaged areas that often develop into holes in the enamel, or hard outer surface, of your teeth.