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.
About Tooth Decay. Tooth decay (also called cavities or caries) is caused by bacteria, sweet foods and drinks, and a lack of oral hygiene. It can harm your teeth and cause a lot of pain, and may even result in loss of teeth. Today tooth decay is much less common than it was just a few decades ago.