The procedure can be carried out in single or two visits. Variations in root canal treatment protocols however will make it difficult to compare with pulpotomy so the aim is to standardize the protocols for the following variables including use of rubber dam, Irrigation protocol with 2-2.5% sodium hypochlorite; working length with combined radiographs and apex locators, automated instrumentation to accompany hand instrumentation and preparation to apical size 2-3 larger than the initial binding file. Canal to be medicated with non-setting calcium hydroxide if done in two visits and root canal filling with gutta percha and traditional sealers (warm or cold lateral condensation) and good coronal seal.

The clinical procedure will be completed over one or two visits. Following adequate anesthesia and isolation with rubber dam, access to the pulp will be gained following caries removal to de-roof the pulp chamber and excision of the entire coronal pulp. The pulp chamber is irrigated with 2% sodium hypochlorite solution and the resultant bleeding from the remaining pulp will be controlled with a cotton pellet soaked in 2% sodium hypochlorite solution. Following complete haemostasis, the pulp stump will then be covered with Biodentine (Septodont Ltd., Saint Maur des Fausse ́s, France) and the tooth permanently restored with a restoration if treatment is completed in single visit or temporized with glass ionomer cement for the final restoration to be placed in the 2nd visit if operator opted for 2-visit treatment.

Root canal treatment - Removal of the inflamed pulp tissues from the whole root canals of the tooth.

(1) Clinical data: absence of pain, tenderness to palpation, presence of swelling, presence of sinus tract, pathological mobility, response to sensibility testing. Patient history taking and clinical examination for symptoms and clinical signs of infection such as swelling, and sinus tract will be performed by a blinded dental practitioner.

(2) Radiographic data: presence of periapical radiolucency, presence of inter-radicular radiolucency, presence of resorption, presence of calcifications. An independent assessor will assess the radiograph obtained at the 12-month review visit.

(1) Postoperative pain will be recorded by patients on day 3 and 7. Pain will be assessed using a numeric rating scale (NRS). NRS is an 11-point numeric scale with 0 representing "no pain" and 10 representing "pain as bad as you can imagine". Patients will be instructed on how to use the NRS-11 at home on days 3 and 7 after the procedure. Patients will be contacted by phone call or text message to collect their responses.