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.
What is a Knee Sprain: When one of the four knee ligaments overstretches and tears. Symptoms: knee ligament pain, swelling, instability, difficulty bending and straightening the knee. Causes: force through the knee or sudden twisting. Treatment: PRICE, exercises. Occasionally surgery is required.