Hair Transplantation with the DHI Technique In recent years, this method has become widespread and has made the process of hair transplantation more comfortable. Technically, it is similar to the FUE hair transplantation method but differs in application technique. Shaveless hair transplantation (DHI hair transplantation) is the process of placing hair follicles one by one on the scalp with a pen-like implantation device (Choi implanter) without creating channels. This allows transplantation to be done among existing long hair.