Benzocaine is a fat-soluble surface anesthetic. Compared with other local anesthetics such as lidocaine and dicaine, its action intensity is smaller, so it will not make people feel uncomfortable due to the anesthetic effect when acting on the mucous membrane. It is a highly fat-soluble drug, so it is easy to combine with the fat layer of the mucous membrane or skin, but it is not easy to penetrate into the human body and produce toxicity.