The Salon Ethos App Comb is an ingenious innovation for applying hair tint, conditioner, masks and other treatments. Say goodbye to harsh lines and wasted product and bin your standard detangling comb.The App Comb features widely spaced teeth as you’d expect from any good rake comb. The clever bit is the roller built into its spine which ensures that product is applied smoothly and evenly to the hair.It’s such a big improvment to hair product application that we think once you’ve tried it, you’ll wonder how you ever coped without one!