The crest is stable and pulls the loose hair incl. The pesky pests from the coat. At least the cat (short hair) got used very quickly to the ridge and enjoyed combing. To prevent the pests from the auskämmten hairball volatilized, I stopped short of a lighter flame to the ball of yarn to ensure that the pests can not survive. While it stinks pathetic, but I was then sure that the critters did not survive my treatment. The comb took not be damaged, it must be ensured only that the flame can not too long to act on the comb.