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. If your teeth hurt, a cavity could be the culprit. Cavities occur when plaque buildup on your teeth creates tooth decay. Plaque is a combination of saliva, bacteria and food particles, and this substance sticks to your teeth as you eat.Plaque contains harmful acids that eat away at your tooth enamel and create tiny holes.avities occur when plaque buildup on your teeth creates tooth decay. Plaque is a combination of saliva, bacteria and food particles, and this substance sticks to your teeth as you eat. Plaque contains harmful acids that eat away at your tooth enamel and create tiny holes.