Final answer:
An ointment type of topical anesthetic should remain on the site of injection for at least 30 minutes to provide optimal effectiveness.
Step-by-step explanation:
An ointment type of topical anesthetic should remain on the site of injection for at least 30 minutes to provide optimal effectiveness.
During this time, the ointment will numb the area and reduce pain. The active ingredients in the ointment, such as lidocaine or benzocaine, need time to penetrate the skin and reach the underlying nerves.
By keeping the ointment on the site of injection for the recommended duration, the patient will experience maximum pain relief during the procedure.