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).his exposes the roots of your teeth to plaque. And if you eat a lot of sugary or high-carb foods, youâre more likely to get cavities. Older adults sometimes get decay around the edges of fillings. Seniors often have a lot of dental work because they didn't get fluoride or good oral care when they were kids.