When does hair get density after hair transplant? (Photo)

The question is difficult to address without seeing your before photos.  However, grafts on average start to grow around 4 to 6 months after a transplant and it takes a year or longer to see the full results.  This being said, you are very young and at risk for losing more hair.  If you are not taking measures to slow down your hair loss you will continue to lose hair and will not achieve the level of density you may expect from a transplant.  While the transplanted hairs for the most part are taken from a donor area not susceptible to hair loss, you will continue to lose your native hairs from the frontal and mid scalp region and thus the net result would be retaining the transplants while continuing to lose your hair.  I would discuss all the options with your surgeon to slow down your hair loss, particularly, because of your young age.

You should wait until 10th month. If your hair does not have density contact with the doctor who did your hair transplant.