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, also referred to as tooth decay or caries, are holes in the teeth. Cavities are the second-most common health disorder in the United States, according to the National Institutes of Health (the first is the common cold) and a very common disorder worldwide. tooth abscess is a complication of tooth decay. Bacteria get into the pulp of the tooth through the cavity and cause infection. Pus then collects in the center of the tooth, causing an abscess. Abscesses can also be caused by trauma to the tooth, such as chipping or breaking, according to the NIH.