Root canal treatment involves creating an access cavity on the tooth's crown to reach the root canal system. Within this system, the infected or damaged pulp (containing nerves, blood vessels, and connective tissues) is carefully removed. The pulp chamber and root canals are then thoroughly cleaned and disinfected. Following this, the emptied space is filled with a biocompatible material, typically gutta-percha, and the access cavity is sealed with a permanent filling or crown. The duration of treatment can vary depending on the extent of the infection. Temporary fillings may be used until the infection is completely resolved. Each tooth has a unique number of root canals. When decay reaches the pulp, it is crucial that all present canals are treated. Generally, incisors located at the front of the mouth typically have one canal, premolars often have two, and molars can have three to four canals. However, the exact number of canals can vary from person to person. While each root usually contains at least one canal, accessory canals can sometimes be present.