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 Causes Of Tooth Decay In Children. Tooth decay in children arises from the same major cause as in adults â bits of food that stick to teeth turn into acid due to the action of bacteria in the mouth and over time, this causes the tooth surface to corrode, leading to cavities.