The requirements for a health care toothbrush are that the width of the toothbrush head is appropriate and the size of the brush head is appropriate, generally covering 2-3 tooth surfaces, which is convenient for brushing teeth. The toothbrush bristles are made of high-quality nylon thread, which has good elasticity and poor water absorption to prevent the accumulation of bacteria. The length of the toothbrush handle is appropriate, which is convenient to hold, so that it has enough power to brush the dirt and massage the gums. The distance between the bristles of each group is appropriate, which is easy to keep the toothbrush itself clean. Each group of bristles is rounded to prevent stab wounds Or scratch the gums. When choosing a toothbrush, you should be familiar with the arrangement of your oral teeth, choose a size, shape, and moderately soft bristles. Generally speaking, you can choose a toothbrush with medium bristle hardness and a small brush head. How long a toothbrush can be used depends not only on the quality of the toothbrush bristles, but also on how the user uses and protects the toothbrush. Generally speaking, for domestic toothbrushes currently on the market, the toothbrush bristles will be bent after 1-2 months, or 2-3 months. The curved toothbrush bristles not only make it difficult to clean food residues in the teeth, but also scratch the gums. Therefore, if you find that the toothbrush hair is bent, you should immediately replace it with a new toothbrush. In addition, the toothbrush heads that are used for a long time are likely to retain bacteria. Therefore, it is generally recommended to replace the toothbrush every three months. In addition, every time you brush your teeth, rinse the toothbrush hair with clean water and dry it, put the toothbrush head up into the mouth cup and let it dry sufficiently, which can prevent bacteria from multiplying on the toothbrush hair. https://www.samemater.com/toothb...ic-cheap-toothbrush.html