You are a miracle - hard teeth

Teeth are the hardest organs in the human body, mainly composed of enamel, dentin, and dentin. Among them, enamel is the outermost protective structure of teeth and the hardest substance in the human body. Experiments have found that a tooth can even withstand a pressure of 638 kilograms, and its hardness can be comparable to quartz.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

The hardest part of the human body is the teeth, which have a hardness in the Mohs hardness range of approximately 5~8MH. Experiments have found that a single tooth can even withstand a pressure of 638 kilograms. The secret to strong teeth actually lies in the surface layer of enamel, which is only 2-2.5mm thick. The composition and structure of dental enamel are closely arranged together, similar to a city wall, and due to the presence of many enamel columns arranged vertically, the direction of force on dental enamel is consistent with that of regular chewing. Therefore, the elastic modulus of dental enamel is higher, and the strength is also higher.