When doctors do hair transplant surgery to replace eyebrows, they have to make sure that they put the hairs in so that they will point in the natural hair direction. For this, the surgeons use very fine gauge needles. They must also use this to help the hair to lie flat. Because the eyebrow hair is made of individual hairs, hair transplant surgery must involve creating those single units of hair. It is not so much where their hair is that is the problem, but how much they have. Hair transplant surgery will not correct this problem. It is best used to move hair from one place to another. There is a very small percentage - about 5% of all women with baldness problems - who are good candidates for hair transplant surgery. Your hair transplant site will be fuller if you have higher density in your donor sites. The density is based upon the number of hair follicles you have in each section of your scalp. If you have a high number of hair follicles per square centimeter than most people, more grafts can be done, so your hair will look fuller. Scientists are working together to find a way to make the surgery work for more people. They also want to see it work better for the types of people who have hair transplants today. One area of research is hair cloning. Hair cloning promises to be a revolutionary procedure that would give people with little hair a chance to have hair transplant surgeries. 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. For example, you need to make sure you get enough blood flow during the night. This gives him an idea of how best to create the design of the hair transplant receptor sites on your scalp. It might make a difference in the angle of the hair or the direction of the hair. The doctor will show you before and after pictures of his past hair transplant patients. Do not be discouraged if they all seem to have the same plain haircut in the after pictures.