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.
Also known as cavities, this condition refers to the decay of the outer surface (enamel) of the tooth. When plaque sticks to the tooth enamel, it feeds on the sugars and starches from food particles in your mouth. This produces an acid that eats away at the enamel, causing weak areas and holes.