The shape of the brush head is generally square and diamond type. The square brush head can effectively clean every surface of the tooth. The end of the diamond-shaped brush head is more sharp than the square design and is easier to penetrate into the mouth. Toothbrush with any shape of the brush head, can clean the teeth, but the size of the brush must need to take into account the size of the mouth, mouth level and personal habits and other factors. Try to use a small brush head, so that deep inside the mouth, to ensure flexible rotation, cleaning the back of the teeth.