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Join Date: Mar 2009
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The root canal system of your tooth can be complex. One of the most common reasons for failed endodontic treatment is that there is an extra canal in the tooth beyond what would normally be expected. Lower incisors, which are "supposed to" have only one canal, can have a second, hidden canal hidden behind the first one. Molars with three roots can have four canals. If the extra canal isn't found, it will eventually become infected and there will be treatment failure, resulting in a tooth abscess.
There may be an obstruction that prevents the dentist from cleaning the entire canal of your tooth.
There can be extra canal branches deep in the pulp system of a tooth that can be difficult or even impossible to reach with a dentist's instruments.
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