Small cuts and scrapes inside the mouth heal up beautifully in 3 or 4 days. Infections of mouth injuries are rare. You'll have difficulty finding where the injury was in a few weeks. Cuts of the tongue and insides of the cheeks are usually due to accidentally biting oneself during eating. Cuts and bruises of the lips are usually due to falls. A tear of the piece of tissue connecting the upper lip to the gum is very common. It can look terrible and bleed a lot until pressure is applied, but it is harmless.
The potentially serious mouth injuries are those to the tonsil, soft palate, or back of the throat (as from falling with a pencil or toothbrush in the mouth). Cuts in the mouth usually don't require stitches except for loose flaps of tissue. Cuts of the tongue rarely need sutures, as long as the edges come together when the tongue is quiet.
Prevent mouth injuries by childproofing your home to prevent falls and teaching your child not to run or play with any long object in the mouth. Reduce sports injuries by making sure that your child wears a mouth guard. Always use a car seat for children.
Press the bleeding site against the teeth or jaw for 10 minutes. For bleeding from the tongue, try to squeeze the bleeding site with a sterile gauze. Once bleeding from inside the lip stops, don't pull the lip out again to look at it. Every time you do, the bleeding will start again.
Put a piece of ice or Popsicle on the area that was injured as often as necessary. If there is pain, give acetaminophen (Tylenol) or ibuprofen (Advil). For a day or so, offer your child a soft diet. Avoid any salty or citrus foods that might sting. Keep food out of the wound by rinsing the area well with warm water immediately after meals.
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