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.
And, as they are very similar, this is not usually a problem. They are different things, however; plaque is the actual bacteria that causes decay and cavities. The tartar on your teeth is an accumulation of stains, saliva, food, dirt, and grime. It makes it easier for the plaque to take a hold of teeth.