Dental trauma is when something bad happens to a person's teeth. It can be caused by accidents, like if a person falls and hits their mouth or if they get hit in their mouth with a ball. It can also be caused by eating something hard or biting onto something hard, like ice cubes. When dental trauma happens, it can damage the teeth or the supporting structures of the teeth, like the gums or the bones of the jaw. It may cause the teeth to loosen, break, crack, chip or even come out of the mouth. The person's gums may bleed or swell, and they may be in pain or feel uncomfortable. If you think you or someone else has dental trauma, it is important to go to the dentist right away so that they can help.