dentogelPharmacological action. Dentogel is an antiseptic. This medication is a quaternary ammonium compound, belongs to the cationic surfactant. Dentogel (Benzalkonium Chloride)Lidocaine Topical (Dentogel) is for external use only. Avoid contact with your eyes, nose, and mouth. If you get Lidocaine Topical (Dentogel) in your eyes, rinse immediately with cool water.