To have optimum effectiveness of the topical anesthetic ointment type,it must remain on the site of the injection for:

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The topical anesthetic ointment needs to remain on the site of the injection for 1 to 2 minutes in order to have optimum effectiveness. This allows time for the anesthetic to penetrate the skin and desensitize the nerve endings, reducing or eliminating pain during the injection or procedure. Leaving it on for a shorter time may not provide enough numbness, while leaving it on for too long may cause irritation or allergic reactions.

To Have Optimum Effectiveness of the Topical Anesthetic Ointment Type,it