What is a local anesthetic agent?

Numbing med. A medication that blocks the electrical signal from traveling up nerves. The numb sensation is the brain filling in the missing information from the nerves. Some examples are lidocaine, bupivacaine, novocaine, even cocaine.
A nerve block. A local anesthetic is a drug that causes blockade of nerves in order to provide anesthesia.

Related Questions

What LOCAL anesthetic agent/medicine is safest for Long QT heart patient? Neck (thyroid) biopsy coming up, local anesth. Will need to be used.

Lidocaine should be. fine in the very small amount utilized. If absolutely necessary Lidocaine with Epinephrine could be utilized but is probably unnecessary. If you are extremely worried it could probably be done nearly painlessly with a skinny needle and no anesthetic. Your own anxiety and intrinsic catecholamine release is probably of greater risk than anything else. Mild sedation might be in order. Read more...

Usual to use pulp desensitizing agent (for three days) in second root canal sitting because it is extremely painful to file even after local anesthetic?

Yes but. There may be more untreated canals or the tooth may be hitting too much, or there may be a neurological issue. Further investigation or having another set of eyes looking at the tooth may be of help. Read more...
No. It sounds like this is not a straight forward root canal case. That being said, it is possible that not all the pulp tissue is removed yet or that a fracture in the tooth may exist. Is it possible that you still have infection? I would give it about 3 days after the root canal is finished. If pain is not gone or significantly lessened, i would return to the dentist. Read more...

Whats a topical anesthetic agent?

Numb skin. Administration of topical anesthetics to control pain associated with procedures such as laceration repair may avoid the need for infiltrative local anesthesia injections and associated pain from the injections. Topical anesthesia also avoids the risk of wound margin distortion that exists with infiltrative injection administration. Many dosage forms exist (gels, sprays, creams, ointments, patch). Read more...