Oral Anesthetic Maximum Strength Gel Fast toothache pain relief. Oral anesthetic. Benzocaine 20%. Anbesol liquid Dentist strong so the pain is gone. Before the dentist gives you a needle, he rubs a pain reliever on your gums. It's the same pain reliever in the same strength that is in Maximum Strength Anbesol. Anbesol liquid For the temporary relief of pain associated with toothache, canker sore, minor dental procedures, or minor injury or irritation of the mouth and gums caused by dentures or orthodontic appliances.