Sekine K, Kawashima T and Hashimoto Y. Comparison of the TNF-a Levels Induced by Human-Derived Bifidobacterium longum and Rat-Derived Bifidobacterium animalis in Mouse Peritoneal Cells. Bifidobacteria Microflora 1994;13(2):79-89.
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.
1 Hydrogen peroxide is an antiseptic that will reduce the amount of bacteria in your mouth and help the canker sore heal. 2  The canker sore should go away in about 2-3 days if you do it twice a day. Unlike cold sores, canker sores or mouth ulcers are not contagious, kissing someone with a canker sore will not harm your partner but may still be uncomfortable for you. 2  Cold sores are different from canker sores â they form on the lips or outside the mouth.