You may need to have the plugs removed in one session and allow that to heal before going on to the next phase. Your doctor may not know the answer to this until after she sees how your first surgery has gone. In any case, it is wise to go in expecting that you probably will need more than one hair transplant surgery. Norman Orentreich began a new field of surgery when he published on the use of hair transplant surgery. It was during this decade that doctors had begun to try moving balding-proof hair follicles to the balding areas of patients' heads. They used hair from the fringe, or back and sides of the head, to accomplish this. Sometimes, they will try to make you believe they do better work than they do. They will show you pictures that are not true examples of their own work. They might show you photos that they have taken using lighting tricks to make the hair look thicker and healthier than it is. It is often hard to spot such tricks, but knowing that some surgeons do them will help you to watch out for them. A good hair transplant surgeon will discourage a low hairline. Instead, he will campaign for a higher hairline. There are several advantages to this. One is that, with less top hair to cover, more donor hair will be saved. Since the young patient will be dealing with this problem for a long time, this is a necessary consideration. Others have thyroid disease or other diseases that affect their hair. A certain type of alopecia results in eyebrow loss. Excessive plucking can be a problem, too. Burns, tattoos, and infections can cause the eyebrow hair to fall out, and some people just are not able to grow eyebrows at all. Hair transplant surgery for eyebrows is different because eyebrows are different from scalp hair. All these parts are necessary to the whole. The first part, and the one most people getting hair transplant surgery are interested in, is the hairs. There should be one to four full hair follicles in the unit and one or two fine hairs as well. There are sebaceous glands in the follicular unit which produce oil.