Quadrajel Gel 15gFor Dental Use Only. Quadrajel Gel contains Lidocaine Topical (2%w w) + Chlorhexidine Gluconate (1%w w) + Metronidazole Topical (1%w w used in the treatment of mouth sores. Lidocaine Topical is a local anesthetic. It works by blocking pain signals from the nerves to brain which decreases pain sensation. Chlorhexidine Gluconate is an antiseptic which binds to the surface of teeth, inner cheeks and gums. This kills the infectious microorganisms that