To have white teeth and a healthy mouth, you need to choose a good toothbrush. A proper toothbrush is even more important than toothpaste. Today, there are a variety of toothbrushes on the market, and the health function of toothbrushes is constantly changing, with some toothbrush bristles made into a concave and convex head, and some toothbrush handles made into a streamlined shape. So, what exactly is the healthiest toothbrush? Experts believe that a good toothbrush, to meet the following criteria. The front end of the toothbrush head should be round and blunt shape. Those toothbrushes on the market with square and triangular heads are best not to buy. Experts recommend the toothbrush head specification, that is, the length of the toothbrush head should be 2.5-3.2 cm, the width of 0.8-1 cm, there are 2-4 rows of bristles, each row of 5-12 bundles of bristles, the front end of the toothbrush head should be rounded and blunt. Each group of toothbrush bristles should be equal in height. Nowadays, toothbrushes with curved bristles on both sides and shorter bristles in the central area are more common, but studies have shown that these toothbrushes do not have much ability to remove plaque. Therefore, it is recommended to choose a toothbrush with equal height bristles. Multiple bundles of bristles are better. Toothbrush bristles are usually arranged in bundles of 3-4 rows, and multiple bundles of bristles are more beneficial to improve cleaning efficiency. The spherical tip of the bristles avoids gum rubbing caused by flat cut ends. Do not choose a toothbrush with stiff bristles. When choosing a toothbrush, use your finger to press the bristles, if your finger has a tingling sensation, it is too hard and should not be used. The handle of the toothbrush should match the shape of the hand, and there are two types on the market: straight and angled. Clinical research shows that when using the straight type, the force is not easy to grasp, while the angle type is easier to reach the plaque removal area. Generally, the angle between the handle and the brush head should be 17°-20°. In addition, there are some toothbrushes for special people. For example, periodontal patients can choose interdental toothbrushes and gum massage toothbrushes, and people with limited hand and foot movement can choose electric toothbrushes. For some whitening toothbrushes on the market, experts point out that toothbrush design should revolve around the theme of efficient plaque removal and oral health maintenance, and any toothbrush should not deviate from the main theme because of the accompanying effects. Whitening toothbrushes may be effective in removing surface pigment, but they may also harm the hard tissues of the teeth and gums. Finally, experts also remind you that you should not only choose a healthy toothbrush, but also learn the correct way to brush your teeth so that you can slow down the process of oral aging and lose your teeth a few years later.