Angular cheilitis is a common skin disease, also known as cracked corners of the mouth, caused by inflammatory reactions in the corner of the mouth. To prevent angular cheilitis, it is recommended to eat more moisturizing foods, such as white fungus, sesame, milk, etc., and to eat less spicy and fried foods. Additionally, pay attention to the care of facial skin, keep the lips clean and hygienic to prevent skin from cracking, and you can apply a small amount of edible oil or glycerin. Finally, ensure a balanced diet and eat foods rich in B vitamins.