The bristles of an electric toothbrush head are usually made of Dupont/Pedex . The bristles must meet certain quality standards before they are purchased, such as softness, elasticity, and wear resistance. For example, high-quality Dupont/Pedex bristles should be soft and resilient, so they can effectively clean teeth while minimizing damage to the gums.
The brush head casing is usually made of plastic materials such as PP (polypropylene) or ABS. These materials need to have certain strength, corrosion resistance, and appearance quality.
During inspection, the dimensions and surface finish of the shell are checked to ensure that it can be accurately installed with the bristles and has a perfect appearance.