The PRO PLUS Dematting Dog Grooming Tool was designed by professionals to cut through heavy tangles and matted areas, without leaving bare or bald spots. The serrated sharpened safety blades will split the mat or tangle allowing for regular brushing or combing of the coat. To use effectively, insert the blade like teeth into the coat, above the affected area and gently work forward into the amt or tangle. slowly, work the tool up and down while continuing to pull through the coat until the clump has been split.