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Mouth Injury

Injuries to the lip, flap under the upper lip (frenulum), tongue, inner cheeks, floor of the mouth, roof of the mouth (hard and soft palate), or back of the mouth (tonsils and throat).
Cuts of the tongue or inside of the cheeks (due to accidentally biting them during eating) are the most common mouth injury.
Cuts and bruises of the upper lip are usually due to falls. A tear of the piece of tissue connecting the upper lip to the gum (upper labial frenulum) is very common and always heals without sutures.
Cuts of the lower lip are usually caused by catching it between the upper and lower teeth during a fall. Most of these cuts do not connect (don't go through the lip). These do not need stitches unless the outer cut is gaping.
Potentially serious mouth injuries are those to the tonsil, soft palate, or back of the throat (as from falling with a pencil in the mouth).