Tumbled smooth rotating teeth actually do prevent pain to pets when combing out tangles or brushing coats. Here’s why: when teeth are silky smooth and rotate 360 degrees and move up and down, pet hair does not snag on the pin or wrap around the pin and pull on the hair follicle. This is what prevents pain. When pet hair is matted and tangled, rotating combs are extremely gentle in untangling mats. Tapered pins are designed to move up and down while rotating. This constant motion gently loosens tangled hair preventing the need for cutting out mats. Yes you must be patient!!…but the Untangler comb can wiggle out the mat. Proven to be extremely effective.