Root canal therapy is needed when the nerve of a tooth is affected by decay or infection. This simple treatment can save your natural teeth and prevent the need of dental implants or bridges. Symptoms of the infection are generally acute dental pain or sensitivity to hot, cold or percussion. If you experience any of these symptoms, your dentist will most likely recommend root canal therapy to eliminate the diseased pulp. This injured pulp is removed and the root canal system is thoroughly cleaned and sealed. This therapy usually involves local anesthesia and may be completed in one or more visits depending on the treatment required. Success for this type of treatment occurs in about 90% of cases.