Sunkenness on both sides of the face can be caused by low fat in the face, age, heredity, atrophy of the bite muscle, and tooth loss. 1. Low fat: people who are malnourished and excessively thin may have a sunken face. 2. Age: Sagging on both sides of the face is also a normal aging phenomenon. With age, the skin tissue on the face loosens and shrinks, collagen is lost, and fat decreases, which may lead to the phenomenon of sagging on both sides of the face. 3. Heredity: Sunkenness on both sides of the face can also be caused by heredity. People with less facial fat or higher cheekbones can make their cheeks look a little sunken. 4. Bite muscle atrophy: Bite muscle atrophy may cause the sides of the face to be sunken. 5. Loss of teeth: When the big teeth are lost, due to eating and constant movement of oral muscles, it is easy to cause pressure on the jawbone, which is easy to appear the phenomenon of facial depression and deformation. Patients with sunken face on both sides usually need to pay attention to good dietary habits, and should go to professional hospitals for treatment after eliminating physiological causes.