The hardness of the bristles: generally can be divided into three kinds of soft, neutral and hard, usually use a toothbrush of neutral hardness is more suitable. When you buy a toothbrush, you can use your finger to press the bristles. If the finger has a tingling sensation, it means that it is too hard and should not be used. The bristles of commercially available toothbrushes are mostly nylon bristles. The elasticity, uniformity and hardness of nylon bristles are better than pig hair toothbrushes, which is more conducive to oral health care.

Angle between brush head and handle: There are two types of toothbrushes available in the market: straight and angle. The straight type is more powerful when used. The angled toothbrush has a better cleaning effect on the posterior teeth. This angle is preferably 17 degrees to 20 degrees.

The top of the bristles: the top of each bristle should be round and blunt without sharp angles, you can use your hands to judge when buying. https://www.samemater.com/toothb...oothbrush-oral-care.html