EDTA root canal lubricating gel has been used in the dental field since 1957, and is the first choice for assisting mechanical preparation. Lubricate the root canal: reduce the resistance of the root canal file in the root canal, the instrument is easy to operate, which is conducive to the expansion of the canal, and can prevent the formation of steps and side penetration. Decalcification has the effect of softening the root canal wall and chelating calcium ions to facilitate the removal of calcified obstructions. Slight foaming: effectively reduce the surface tension of water, speed up the removal of dentin debris in the root canal, and avoid deposition in the apex of the root. Protection of instruments: non-corrosive to instruments, preventing instrument separation (broken needle) during root canal preparation. Water-soluble gel, easy to clean without residue.