A tooth abscess is a sac of infected material called pus in a tooth or the gums.
Abscess Between Tooth and Gum
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A tooth abscess is caused by bacteria. It begins when bacteria invade and infect a tooth. This results in pus build-up. When the pus is unable to drain, an abscess results.
Conditions that allow bacteria to invade a tooth include:
- Severe tooth decay
- Break or crack in a tooth that lets bacteria invade the pulp
- Failed root canal treatment
Last reviewedAugust 2014by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.