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Periapical periodontitis ( also termed apical periodontitis , AP , or periradicular peridontitis ) is an acute or chronic inflammatory lesion around the apex of a tooth root which is caused caused by bacteria l invasion of the pulp of the tooth .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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