The purpose of anesthesia, which can be used for dental treatment during pregnancy, is to make the treatment painless. Because pregnant women are more sensitive to pain than regular patients, the treatment needs to be used in a painless manner. Anesthesia is the prerequisite and foundation of pain-free treatment. Injecting anesthetic actually has no effect on the fetus, because anesthetic is mostly free of side effects. After the anesthetic is injected, it can be metabolized in the body relatively quickly. Commonly used anesthetics can be metabolized by the body in 30 minutes to several hours, so there is basically no effect on the fetus.