What gives you an absess under a tooth?

Answer 1

A tooth absess is formed by infection either via a periodontal pocket(space between your gum and tooth) or via the tooth eg, decay or a broken tooth. Either way their is an accumulation of necrotic(dead) tiddue which the body tries to get rid off. But if there is no way for the necrotic tissue to be expelled it just builds up forming an absess. That is why if it is in relation to a tooth you would either need a root canal or an extraction, depending on the amount of remaining tooth structure.
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Answer 2

That is s simple question to answer. An abscess from a tooth occurs because the nerve and blood vessels or pulp, within the tooth have died. Why does this tissue die? Here is a couple of scenarios. The pulp can die because a cavity has allowed bacteria and their byproducts to get too close to the pulp tissue. Or the pulp tissue has been torn because a tooth was hit and the tooth moved thereby tearing the tissue.
The body's reaction to dead tissue within it is the same as if you got a wood splinter in your finger. White blood cells are sent in to bind to the foreign particle or dead tissue and to remove it from your body. Bacteria live off the dead tissue, so as long as there is dead tissue present the bacteria numbers increase. So do the white blood cells. Before you know it, you have a raging infection going on just below the tooth. This infection because it is contained within the jawbone quickly becomes pressurized. This is the cause of the pain of an abscess. Because an infection is acidic, it starts to dissolve away some of the bone. That is why if you look at an x-ray of an abscessed tooth you will often see a dark circle around the tooth root tip. This abcess will continue to eat away at the bone, looking for a way out. Usually the infection will eat its way through some thin bones and out into the gums. The gums will swell and eventually they will burst a little drain hole. Now that the infection can drain out, the pressure will be released and the pain will be lessened.
All of this can be avoided by removing the dead tissue from the tooth, disinfecting the canal and then sealing it so that bacteria can't get into it and find a nice warm place to grow. This is what a root canal does.

Answer 3

bacteria, poor oral hygiene, low immune system.