Benzocaine is the most commonly used topical anesthetic in dental procedures due to its rapid onset and effective surface numbing properties. It is applied directly to the mucous membranes to provide localized pain relief before needle insertion or minor soft tissue manipulation. Unlike injectable anesthetics, benzocaine acts by blocking sodium channels on nerve membranes at the site of application without systemic absorption. Its low solubility in water limits deep tissue penetration, making it ideal for surface anesthesia. Additionally, benzocaine has a favorable safety profile when used appropriately in small amounts.

Reference: Clinical Anesthesia, Barash, 7th Edition.