@Dazed This is my exact mindset as well. I do want to play it safe. But the reason i ask this was because I had heard if you don't clean the recipient area "well enough" then the lingering mini flakes and sebum build up on the scalp in the recipient area can inhibit growth... There is no desire for my to scrub my head, I absolutely want to just put shampoo on it, rinse it and just let it air dry lol. I just want to make sure
It is very common to have a repeat top up procedure especially in areas where your native hair has continued to recede leaving only transplanted hairs.
The surgeon will use magnifiers when making the slits to ensure no healthy grafts are damaged. The new grafts will be implanted in these slits.
So in answer to your question, the subsequent incision and implantation process will not cause damage to your existing follicles.
Unlimited grafts often means the surgeon/technicians will over-harvest your donor area and plant as much grafts as possible to ensure just enough survive to give you an OK result so there are no comebacks.
Hair loss is progressive so a few years down the line when you might need another procedure due to further recession you have little scalp donor left. An ethical surgeon will look at your age, family balding history, medical history and other factors and devise a plan to maximise your grafts to ensure you are not in the situation described above.
Consulting with the 2 surgeons mentioned above would be a good start for you.
Is there some overwhelming desire to scrub your head? Why not play it safe? I went at least 2 months with just putting shampoo on and rinsing, and letting it air dry. You just paid a kings ransom to get the implants and you can't be gentle for a little while.