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A cavity develops when a tooth decays. A cavity is a hole that forms in your teeth, and it can grow bigger and deeper over time. If you have a cavity, it's important to get it repaired. Your dentist will carefully examine your teeth and may take X-rays. If your dentist discovers a cavity, he or she can repair it for you by first removing the rotted part of your tooth with a special drill. The dentist then fills the hole in your tooth with a special material & the result is called a filling.