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.
Sugar causes tooth decay and cavities. When we consume sugars, it ruins our teeth a number of different ways. 1. Sugars cause teeth to decay because they increase acidity in our mouth. People who constantly eat sugars, maintain a high level of acidity that can demineralize teeth and weaken tooth enamel.