<human>: What are some of the most common causes of a cracked tooth?
<bot>: 
1. Tooth decay, which is caused by bacteria that feed on sugars in food and produce acid that can erode enamel and cause cavities.
2. Trauma to teeth, such as from biting down too hard or grinding your teeth together.
3. Extraction of a tooth, especially if it was done improperly.
4. Infection, such as from gum disease.
5. A blow to the face or head.