Without review by other doctors, Gho's theories cannot be tried and evaluated. Certain types of auto-immune diseases, such as alopecia areata can now be treated by means of hair transplant techniques by using the donor strip method. Yet, in the future, hair cloning will make hair transplant easier for these people who often have very little hair to use for grafts. This is an interesting question, because one would think that looking in the mirror would be more a problem of people who have already had hair transplant surgery. Actually, quite the opposite is true. When people are concerned about balding, they spend much time looking into a mirror to double-check and re-comb their hair to make it look like it covers more of their heads. They are made with a very thin surgical needle. The surgeon must have an eye for detail to properly set the receptor sites. He must also be very artistic to achieve a natural look, especially at the hairline. The direction the hair grows, both on the front of the head and at the crown, are very important, too. Then, you can use this number to figure up the grafts needed. Based on the fact that the average Caucasian male has a density of 2 hairs per millimeter, it can be assumed that the average density of hair is 1250 hairs per square inch. Figuring at an average of 2 hairs per follicular unit, it would take 625 follicular units per square inch. Often people have sensitive scalps and the thought of someone making cuts there seems hard to think about for these people. There is disagreement as to whether hair transplant surgery is painful, though. Some say that hair transplant surgery is similar to a visit to the dentist. This does not seem like a description of something that is pain-free. Other patients have rubbery skin that stretches too much and so causes wide donor scars. These two groups add up to about 5% of the patients who have hair transplant surgery. The other 95% of patients have no problems with their tiny scars at all. The hair transplant doctors are able to keep the donor strips very thin.