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.
Finding a dental cavity before it starts causing you pain can help you avoid extensive damage and possible tooth loss. If you start feeling pain and aching in your mouth, see your dentist as soon as possible. How Do Cavities Develop? The cause of cavities is tooth decay. The hard surface, or enamel, of your teeth can become damaged over time. Bacteria, food particles, and naturally occurring acids form a sticky film called plaque that coats your teeth.