What anesthetics do the dentists use?

During the doctors advise for surgery and complete removal of teeth. The following anesthetics are normally used before surgery or to alleviate the pain in general:

Local anesthetic - A local anesthetic is injected into the gums to numb the tongue, allowing for a painless surgical procedure.

Intravenous sedative - Until administering a local anesthetic, an intravenous sedative is normally administered through the arm. This causes the patient to become drowsy which prevents him from feeling any discomfort during the procedure.

General anesthetic - It is only injected after a highly complex and vital wisdom teeth operation to put the patient to sleep.