Langli medicine is clinically used for pulp inactivation Low toxicity: no arsenic, self-limiting safety: no pain during pulp inactivation, no damage to the surrounding tissue and alveolar bone Effective: ideal inactivation effect, extraction There is no pain when pulping. Adults and children can use the blue paste for easy identification and cleaning. The smell is fragrant. It is easy for patients to accept and form. It is convenient to place the same tooth.