whats the diff between local and general? (havent seen any real explanation)
EDIT: local=awake, general=asleep?
Well apparently the dental profession uses the term "general anesthesia" for IV sedation. While IV sedation does, albiet barely, fit within the definition of "general anesthesia", it isn't the same "general anesthesia" used by the non-dental medical profession (i.e. MD or DO).
General anesthesia in the rest of the medical world means giving you agents both intraveneously and inhalation which result in the complete loss of consciousness, and typically (though not always) involves the use of paralytic or respiratory depressive agents which effectively leave you unable to breathe on your own. You are ventilated artificially, by machine or by hand. Several reflexive mechanisms may also be lost, such as the gag and swallowing reflex, so you cannot protect yourself against aspiration.
This is rarely done for dental procedures, except in the case of young children, mentally retarded adults, or adults with extreme anxiety over the procedure (read: a phobia). General anesthesia is not done in a dental or doctor's office, it is done in a bona fide hospital or outpatient surgical facility with advanced cardiopulmonary resuscitation capabilities. General anesthesia may not be administered except by licensed anesthesiologists (MD or DO) or certified registered nurse anesthetists (CRNA).
Dentists may administer IV sedation, however, which the dental profession appears to call "general anesthesia". IV sedation is self-explanatory; you receive a sedating agent intravenously. Sedation is merely an altered (lower) level of consciousness and alertness, as opposed to a complete lapse of consciousness and alertness including the loss of reflexes and respiratory abilities.
In any case, minor oral surgery such as a molar extraction will use a local anesthetic. A local anesthetic is lidocaine or procaine, an antiquated trade name is 'novacaine'. This is an injectable agent which 'numbs' an area by interfering (blocking) sensory (pain) nerve impulses, but does not result in an altered level or state of consciousness.