The choice of bristles should be soft and hard moderate, or slightly softer. But note that too soft brush hair is easy to brush not clean. Bristles are made with nylon. Can be divided into two kinds-ordinary silk and DuPont wire. DuPont is a good elasticity, not easy to fall. It is also important to grind the wool process. Brush hair After cutting, if not after the smooth treatment, easy because too sharp and cause damage. The brush Maojian grinding round grinding toothbrush, can prevent this injury, the protection of the gum more powerful.