A toothbrush with a smaller brush head can rotate sensitively in the child's mouth. Of course, it does not mean that the smaller the brush head, the better. Too small brush head will also affect the efficiency of brushing teeth. In this regard, the national standard has stipulated the specification of toothbrushes. The length of the brush head arrangement of children's toothbrushes is ≤2.9 cm, which is almost the length of 2~3 incisors; the width is ≤1.1 cm, about no more than 4 rows of bristles, and the handle length is 11~18 cm. At the same time, the head of the toothbrush cannot be disassembled to avoid accidental swallowing by children. According to the national standard, the bristles of children's toothbrushes are soft bristles with a diameter of ≤0.18 mm. Thinner bristles deepen the gap between the teeth for a cleaner cleaning. However, it does not mean that the thinner the better. For example, some ultra-fine bristles toothbrushes with a diameter of only 0.01 mm are not hard enough, and it is not easy to clean some thicker tartar. The material of the bristles is preferably nylon. The nylon filaments are slender and soft, which can clean the gaps between the teeth, and have good elasticity, which has a good massage effect. How to judge whether the bristles are soft and hard? The hair planting machine can directly press the bristles on the back of the hand. If there is a tingling feeling when pressing lightly, it means that the bristles are hard. If the bristles are not seriously deformed and there is no tingling, it means that the bristles are moderately soft and hard. The shape of the tip of the bristles basically determines the wear on the tooth surface. According to the national standard, the top profile of the bristles of children's toothbrushes should be sharpened to remove sharp angles, and there should be no burrs. In addition, due to the fragile oral cavity of children, the grinding index of children's toothbrushes is more severe, the grinding rate of toothbrush mechanical flat hair type should be more than 70%, and the grinding rate of special-shaped hair type should be more than 50%.
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