Lidocaine is The best anesthetic agent. It is indicated to produce local anesthesia when applied through infiltration or nerve block. It has a rapid, deep, and extended anesthetic action. It allows working in the most delicate dental procedures such as preparation of stumps in live teeth, pulpectomies, and chirurgical treatment of periodontitis.
The non-ionized ratio and the diffusion capacity of this anesthetic decrease in presence of an acid pH.