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.
Torn ligament or tendon. Knee pain may be caused by torn ligaments or tendons. Ligaments are tough bands of tissue that connect the bones at the knee joint; tendons connect the muscles to the bone. You can tear these tissues during running sports such as rugby or football.udden pain in one of the knees is usually the result of overusing the knee or injuring it. In many cases, you don't need to see your GP. The knee joint is particularly vulnerable to damage and pain because it takes the full weight of your body and any extra force when you run or jump.