… reflects our inner being. On the basis of various criteria, such as covering, color, thickness, toothprints or points, one can look at the internal condition of the body. For this purpose, the tongue is divided into different areas, which belong to certain organ systems. For example: a thick yellow covering — that mucus and heat are present in the body .… reflects our inner being. On the basis of various criteria, such as covering, color, thickness, toothprints or points, one can look at the internal condition of the body. For this purpose, the tongue is divided into different areas, which belong to certain organ systems. For example, a thick yellow coating shows that mucus and heat are present in the body.