The XCF anesthetic super strong dropper is meant to be used as a pain-killer during the procedure. It begins to take effect within just 2 minutes after being applied, and takes away any sensations of pain. The convenient stabilizer with a dropper allows you to correctly regulate the amount of the product used. Crystallization may occur during use, but this is a normal phenomenon which does not affect the quality of work in any way. Simply warm up the bottle in your hands or in warm water, and the cream will be ready to be used again.