Another aspect of scarring is when doctors go in for multiple hair transplant surgeries. A new strip of donor tissue has to be taken each time to supply the grafts for the new transplant. It would seem that this would lead to a large number of scars on the back and sides of the head. Actually, there is a hair transplant procedure that keeps the scarring to one thin line. 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. The doctor will blend it in with the grafts as he goes. It may seem odd, but once the grafted hairs are set, they are just as strong as the rest of your hair. You can cut them, comb and brush them, and even dye them in time. New hairs start to grow within three months. You will find you need haircuts more often, as your hair will grow about one or two centimeters per month. It does not matter what kind of hat it is, as long as it is fairly loose-fitting so that it does not rub on your new hair transplant grafts. You should not have to put up with this for long. After a couple of weeks, you can replace the cap with sunscreen. It should have an SPF of at least 30. Having just the right amount of blood flow to the hair transplant sites will make a big difference in how fast they heal. This is never a good idea. Once you start having the grafts done, you are committing to a full set of procedures. Otherwise, your hair will end up looking out of balance. 5. Do not get involved with a doctor who does not listen. A good doctor knows how important the hair transplant is to you. He will listen to your questions about hair transplant and provide intelligent answers.