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.
Cavities are what you get from tooth decay -- damage to the tooth. Tooth decay can affect both the outer coating of a tooth (called enamel) and the inner layer (called dentin). What causes decay? When foods with carbohydrates like bread, cereal, milk, soda, fruit, cake, or candy stay on your teeth. The bacteria in your mouth turn them into acids.