The entire treatment cycle for root canal therapy may take 2-3 weeks and typically requires 2-3 visits, with each treatment lasting about 1 hour. Root canal therapy is a treatment that blocks the infection on the crown and root side by filling the root canal with a cement tip or other paste, which in turn stops the infection from spreading. It generally involves three stages: preparation of the root canal, disinfection of the root canal and filling of the root canal. The first visit usually involves extraction of the necrotic or infected pulp, followed by initial root canal preparation, sealant and root canal disinfection. At the second visit, a complete root canal preparation is performed again, followed by a decision to fill the root canal depending on whether the tooth is clinically symptomatic or not, or to seal the canal again if the tooth is still uncomfortable. The root canal filling is performed at the third follow-up visit. If there are no other special circumstances, the treatment process takes approximately 2-3 weeks. If there are other problems, the specific treatment period may be slightly longer. If you have a toothache, you should go to the dental department of the hospital in a timely manner. If you are sure to have root canal treatment, you should arrange a reasonable time and follow the doctor’s instructions on time, not to postpone the treatment.