Root canal therapy is needed when the nerve of a tooth is damaged by decay, infection or trauma. It is usually a painless procedure aimed at saving a tooth and restoring it to normal function. It is an excellent alternative to removing a tooth.
Signs and symptoms which may indicate the need for root canal therapy:
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An abscess (or pimple) on the gums
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Sensitivity to hot and cold
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Tooth pain
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Swelling or tenderness
X-ray evidence of nerve damage
Reasons for root canal therapy:
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Decay has reached the tooth pulp (nerve)
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Infection or abscess inside or around the tooth
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Injury or trauma to the tooth