This product USES the food grade high tear silicone, solve the problem easily chewed bad review, 4 face brush, 360 degrees to brush your teeth, no dead Angle in all directions, play both sides of the other shortcomings brushing your teeth, mouth into the toothpaste at the top of the flat design, avoid in the process of brushing your teeth toothpaste into the dog's mouth, the brush has a hole out of toothpaste bubbles, 4 feet at the bottom of the design, can better control and grasp direction!