In addition to normal physiological phenomena, cracks on the tongue can be seen in essence and blood deficiency, yin deficiency and fire (deficiency of yin and essence in the body, resulting in hyperactive fire) or spleen deficiency and qi weakness. Tooth marks on the tongue are often seen in spleen deficiency and internalization of water-dampness. 1. Deficiency of essence and blood: deficiency of essence and blood can not moisten the tongue surface, cracks will appear, and see the tongue pale white, color of the face or yellowish, the color of the claws and nails pale white, dizziness, dizziness, palpitations (heartbeat faster, often accompanied by panic) insomnia. 2. Yin deficiency and fire: Yin deficiency leads to insufficient fluid, which cannot moisten the tongue, and cracks will appear, together with red tongue, yellow moss, five heart-heat (heat in the heart of the two hands and two feet, and self-consciousness of the heart and chest), night sweating (abnormal sweating after going to sleep, and waking up and sweating stops), and so on. 3. Weakness of Spleen-Qi: If the Spleen-Qi is weak (weakness of the Spleen-Qi), the tongue loses its nourishment and cracks. 4. Spleen Deficiency with Dampness: Spleen deficiency is incapable of transporting and transforming water-dampness, and water-dampness stops at the tongue, resulting in a chubby tongue with teeth marks, as well as a pale tongue, white and greasy moss, fatigue (mental exhaustion, physical weakness), heaviness of the limbs, and loose stools. Cracks and teeth marks on the tongue are not necessarily a single type of evidence, do not blindly use medication, but must be treated after identification by a Chinese medicine practitioner.