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.
An infected tooth that has not received appropriate dental care can cause a dental abscess to form. Poor oral hygiene, (such as not brushing and flossing properly or often enough) can cause cavities to form in your teeth. The infection then may spread to the gums and adjacent areas and become a painful dental abscess.