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What is pH and why is it in my shave gel?

pH is a measure of the acidity or basicity of a solution. pH scale is 0-14, 7 being neither acidic, abrasive or irritating. Anything less may create some irritation for those who have sensitive skin. Pure water is ~7pH. Edge® Shave Gels have a pH balance of 8.5 - 9.1.