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.
The main causes of dental abscesses are tooth decay and trauma. With regular tooth decay, small cavities can lead to big problems if they go untreated. Once the bacteria reach the root of the tooth, the infection can take hold quickly. Age can play a factor in tooth decay as well.