Procedures to Make Hair Grow Straighter or Curlier?

Most people who have curly hair, would have it in all areas of the scalp, so that hair transplants would not be successful to straighten the hair, unless donor areas of straight hair were found and used. It has to come from you, not a different person. It is not unusual that fine hair transplanted from a donor site in the scalp to the recipient sites grows slightly wavy after transplantation. The technique is available that can uncurl hair by changing the hair follicles.

Whether hair is straight or curly depends entirely on inheritance. A straight hair shaft on cross section is round and a curly hair on cross section is oval. There really is no direct way to control this.

Making the hair straighter or curlier is not done with surgery but rather with a skilled hair stylist who can do this quite well.

Changing the curl or straightness of your hair does not require surgery. A good cosmetologist can treat the hair to effectively make these changes -- it is a relatively simple treatment. 

A hair transplant takes your hair and moves it around. If it is curly it remains curly. I have found that the Brazilian keratin treatment works very well to make curly hair straight for several months. Laser hair removal removes hair but does not affect the curliness or straightness of hair.