It can be corrected. First of all, you should prepare a special head shape correction pillow. I bought a pillow for the patient lying on his side in the hospital, which was divided into two halves. Put your head between two pillows. Because of its own gravity, it will squeeze both sides of the head, and both sides will be slightly sore. Lying in bed every night, my head is flat, and I get better after a month or two. Besides, I am 32 years old. If you are younger than me, it will be easier to correct it.