Drugs used in root canal treatment are usually divided into disinfecting drugs and drugs that induce apical development, such as camphor phenol and calcium hydroxide. 1. Disinfectant drugs: mainly used for disinfection inside the root canal to kill the pulp and infected material left inside the root canal wall, commonly used formaldehyde cresol, camphor phenol, calcium hydroxide, iodoform, etc. For some with obvious exudation, the disinfectant containing iodoform can be chosen; calcium hydroxide can be chosen for good conditions. Formaldehyde cresol is highly toxic and should be used with caution. 2. Induction of apical development: some patients with incomplete apical development need to be put in the root canal to induce the completion of apical development, usually ranging from 3 to 24 months, usually choose special calcium hydroxide. It is recommended to go to the stomatology department of regular hospitals.