A tooth (plural teeth) is a small, calcified, whitish structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores, also use teeth for hunting or for defensive purposes. The roots of teeth are covered by gums.
Symptoms can include: 1  A popping sound (or a popping or snapping feeling) at the time of injury can sometimes be heard (or felt) if a ligament is completely torn. 2  Swelling of your knee. 3  Pain in your knee.  Tenderness around your knee on 1  touching. Not being able to use or move your knee normally.
If the medial collateral ligament has been damaged or torn, you will usually have: 1  Pain, which can range from mild to severe, depending on how serious the injury is. 2  Stiffness. 3  Swelling. 4  Tenderness along the inside of the knee. 5  A feeling that the injured knee may give way under stress or may lock or catch.