The permanent cure for split ends is scissors. But if you’re not ready to chop off your hair, there’s the Tresemm√© split-end treatment, which temporarily glues each frayed strand back together. It’s pretty hard-core science: When a hair splits, it gets a negative charge. The combination of two polymers inhas a positive charge. The split hair and the serum act like magnets, bonding to each other, and the Band-Aid effect is visible after three washes. “While these polymer bonds are only temporary, by using the products regularly you avoid the ends splitting again,” says cosmetic chemist Jim Hammer. “Hair will appear smoother, fuller, and healthier, with ends that look to be freshly cut.”

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