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The higher the concentration, the better the solvent and antibacterial properties, but its toxic effect is also increased. Its clinical use is generalized, from lower concentrations of 0.5% to higher concentrations of 5.25%. The bactericidal and tissue dissolving action of sodium hypochlorite can be modified by the concentration of this, the temperature and the pH of the solution. Hypochlorite penetrates all irregularities in the root canal. It moistens the walls of the root canal, favoring the action of the instruments. Irrigation with sodium hypochlorite expels the debris generated by the biomechanical preparation of the canals.

Destroying bacteria (including viruses) and neutralizing their components and antigenic products. It is the most effective solvent for pulp tissue. Dissolve pulp tissue remains (It is effective in both vital tissue and necrotic tissue).The main properties of this irrigating solution are: It is defined, according to the American Association of Endodontists, as a clear, pale, yellowish-green, extremely alkaline liquid with a strong chlorine odor, which has a dissolving action on necrotic tissue and organic remains and is also a powerful antimicrobial agent. The sodium hypochlorite (NaOCl) is a halogenated compound that has been used as an irrigating solution in endodontics since 1920, complementing the biomechanical preparation of root canals. One of the main irrigating solutions in the treatment of endodontics is sodium hypochlorite, being the most recommended alternative for endodontic irrigation. Increase surface energy of the duct walls, favoring the contact of drugs used to heal temporarily and allow retention when plugging the ducts.Moisten or lubricate the walls of the dentin to facilitate the action of the instruments used to perform endodontics.AND remove residual layer, composed of organic and inorganic remains (pulp remains, dentin chips and necrotic remains).The irrigation in endodontic treatment, it consists of washing and suctioning all the remains and substances that may be contained within the pulp chamber or root canals. One of the steps of endodontics is irrigation within the canal to remove and clean the root canals during this dental treatment.