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An abscess is a pocket of pus that forms around the root of an infected tooth. Anyone, from children to the elderly, can get one.
Your tooth is hard on the outside, but the inside is filled with a pulp made up of nerves, connective tissue, and blood vessels. Sometimes it gets infected. Most often that results from:
A deep cavity or tooth decay
Gum disease, also known as periodontal disease
A cracked tooth
You might notice:
Pain
Swelling
Gum redness
Bad taste
Pain when you chew
Jaw pain
Fever
Swollen lymph nodes
Trouble breathing or swallowing
Sometimes an abscess causes a pimple-like bump on your gum. If you press it and liquid oozes out, it’s a sure bet you have an abscessed tooth. That liquid is pus.