Good eating depend upon good mastication. It is correlated good (normal) dental-arch and teeth. Recently, Japanese persons have disordered function by broken dental-arch. These cause life related disease, for example, diabetes, high blood pressure and hyperlipidaemia, are able to solve by good mastication.   Good mastication contribute to accelerate brain activity and brain clearance. So, this clinical examination is applied to prevent the melancholia and dementia.