Because many toothpastes include sodium lauryl sulphate — an ingredient that helps dry cold sores out — in their formulas, it can help speed up healing time. While using toothpaste to help heal a fever blister hasn't been officially studied, there's enough anecdotal evidence to give it a try. To start making your ointment, put a healthy squirt of toothpaste into a small bowl or ramekin.
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