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 form in the roots and surface areas of a tooth. They are generally caused from a lack of proper oral health care, such as cleaning and brushing. They can also be caused from excessive consumption of sugary drinks and snacks. Cavities are a leading cause of headache pain.