What determines whether a cavity needs a root canal or not?
Answers:
There are several scenarios which can lead to determining the need for performing root canal therapy:
Abscessing: infection at the Apex (tip of the root) which usually, but not always is the cause the cause of a the classic toothache
Trauma: which causes the nerve to die resulting in a loss of blood supply and vitality.
Or perhaps you had a deep cavity and during the process of removing the decayed part of the tooth the pulp (nerve chamber, blood supply) was exposed. When this happens the nerve must be removed and the canals, which are the nerve access from the jaw must be cleaned, enlarged slightly, and sealed to prevent bacteria present during the exposure from becoming an infection inside the tooth causing eventual problems such as abscessing and pain.
These are simple descriptions of a detailed process that can further be explained if needed, and are not the only reasons for determination of the need for root canal therapy.
I hope this does help. If you have a particular concern or scenario you want to discuss concerning root canal therapy I would be more than glad to try to answer your question.
A tooth needs a root canal when the decay has reached the pulp of the tooth. Normally a cavity is fairly shallow, but when it gets deep and goes into the pulp of the tooth thats when it needs a root canal. You don't have to have any infection or pain to have this happen. An x-ray will let the dentist know that the decay has reached the pulp.
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