A tooth has three layers enamel, dentin, and pulp. When a cavity is deep and has reached the pulp, RCT is required to be done.
The procedure is entirely painless and includes the removal of the entire infection from within the tooth; all the root canals are cleaned and medicament is placed. The tooth is then sealed to prevent infection after the RCT procedure.
After RCT is performed, the tooth turns brittle and weak. This is why, post the RCT procedure, placing a crown is extremely important for protecting the tooth.
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Placing a crown strengthens the tooth, making it more capable to withstand forces than the normal tooth.
Nowadays even badly broken teeth are saved by RCT and rebuilt with metal or white fiber posts & core.
Single-sitting RCT procedures can also be performed in selected cases, saving precious time for the patient.