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A Sharecare Ad Target User , Administration, answered. An outbreak of oral herpes, or cold sores, should go away on its own in about one or two weeks. Antiviral medications can help them heal faster if taken early. Talk to your doctor if your cold sores do not go away after two weeks. Helpful? 1 person found this helpful.
How Long Do Cold Sores Last With Treatment? If your cold sore has lasted longer than two weeks, or the sore is too painful or unsightly to endure, go to the doctor. Your doctor can prescribe treatment to heal your cold sore in five to seven days, like Denavir and Xovirax. Abreva, an over-the-counter cold sore remedy available from the pharmacist's counter at most drugstores, is a topical cold sore medication that is FDA-approved to shorten the healing time of your cold sores.