Prevent skin scalp irritation, burning, itching, chemical burn allergic reactions. STB, Stop the Burn, is a conditioning agent that alleviates the hair and scalp from the effects of harsh chemical processes. The active ingredient is menthol which provides a soothing sensation that helps relieve irritation. Directions: Add 20 drops of STB to color mixture, bleach or perm solution. Add 2-3 drops directly to sensitive, irritated or itchy scalp areas to eliminate irritation.