White and cracked tongue may be due to chronic tongue inflammation, yin deficiency and fire, heart fire, etc. If there is a lack of vitamin B in the body or chronic tongue inflammation due to other factors, longitudinal and horizontal cracks may appear on the tongue. You should keep your mouth hygienically clean, brush your teeth in the morning and evening, and rinse your mouth in time after eating, and you can choose a mouthwash with anti-inflammatory effects to prevent food residues in the tongue cracks, which may cause oral infections. In addition, white and cracked tongue is also one of the symptoms of yin deficiency fire. In addition, there are also common manifestations of yin deficiency fire, dry throat, night sweating, insomnia and excessive dreaming, etc. You should pay attention to ensure sufficient sleep time and eat foods with the effect of lowering deficiency fire appropriately. If there is a problem of strong heart fire, the body will lack fluid to nourish the organs in the body, and the organs will easily feel dry, leading to problems such as yellow urine, dry mouth, and cracked tongue. A white and cracked tongue may indicate a disease in the body, which requires vigilance and healthy habits, and if the situation is serious you need to go to the hospital for a comprehensive examination as soon as possible.