Hair follicle that contain 2 or 3 or 4 hairs can be split to single hair grafts so that you can use it for the hair line. 2 or 3 hair grafts on the hair line will not look "natural".
When grafts are split into smaller grafts, it should be done under a microscope. Great care must be taken to be sure that the growth centers in each hair is identified and moved with the split grafts
fierens,The answer is yes, and it can be done accurately with a microscope like we use in our office. But in reality wether we are performing FUE or FUT it is seldom if ever needed. Because in FUT about 12% or higher are naturally occurring one hair graft, which should generate 240 or more one hair grafts for the anterior hair line. In FUE of course we select which follicles to harvest, so we can get what we need.
Bernardino A. Arocha, MD
In patients who need more single-hair grafts than occur naturally in the donor area (this is less likely to be a problem with FUE than with strip harvesting, since the former allows single-hair grafts to be be "cherry-picked"), multi-hair follicular units can be split to produce single-hair grafts; however, this is considered somewhat of a last resort, since many surgeons believe that the follicles in a multi-hair follicular unit are more likely to survive and grow when that follicular unit is kept intact. But I wouldn't get too hung up about the details of the graft count--it sounds as if your surgeon was aware of your concerns and determined to give you a natural looking hairline. Try to be patient, give your surgeon the benefit of the doubt, and wait to see what the next few months bring. If worse comes to absolute worst, you could probably have your hairline softened with a second procedure.
This is a balance because single hair grafts do not live as well and to many of them also can produce atypical over overly thin results.