A crowded mouth can be caused by traumatic injury, but it’s much more common to be a simple genetic abnormality that leaves a person’s mouth with less space than is needed for all their teeth. Unable to grow in the correct place, teeth are instead squeezed in between, in front and behind other teeth, leading to an overcrowded jaw and an abnormal bite. There is also a heightened risk of gum disease and ulcer in the mouth, as well as excess strain on the jaw, which can lead to headaches. Treatment options include orthodontic procedures to straighten out the teeth and move them back into position, but often some teeth must be removed to provide space for the remaining ones to come through.
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