FUE or DHI?

Where exactly do the two techniques diverge?

The harvesting stage is identical in both: shedding-resistant follicles at the nape and temples are removed one at a time with micro punches 0.7–0.9 mm across. At this stage there is no difference between FUE and DHI.

The divergence begins at placement. In FUE, channels are opened in the recipient area first with a steel or sapphire tip, and the grafts are then placed into them with forceps. In DHI, opening and placing are done in a single movement with a Choi pen that already carries the graft at its tip.

That single step shortens the time the graft spends outside the body. In exchange, each graft has to be loaded into the pen individually, so placement progresses more slowly.

Which one transfers more grafts in a single session?

Classic or sapphire FUE typically transfers 2,000–4,500 grafts in one session. Because placement takes longer per graft in DHI, the typical range there stays at 2,000–3,000.

That difference decides the technique outright over large areas. In pictures like Norwood stage 5–6, where 3,500 grafts and above are being discussed, the FUE family fits the operation into a single day; the same number in DHI can spread over two.

Which is chosen when grafts go between existing hairs?

Where an area has thinned but not gone completely, DHI comes to the fore. Because the channel is not opened as a separate step, the chance of damaging the healthy follicles already there is lower.

In the diffuse thinning seen in women, and in plans that add density between existing hairs at the crown, the preference usually falls to DHI for exactly this reason.

Which technique is used for an unshaven transplant?

Unshaven work uses the Choi pen, which means the technique is DHI. Because the existing hair is not shortened, the pen places the grafts from between the long hairs.

The graft ceiling drops in unshaven planning: the typical range is 1,500–2,500 grafts. That is not a shortcoming of the technique but a consequence of how much longer each graft takes when working between long hairs.

Which is better at what?

Both techniques take the same grafts from the same donor area and there is no difference in permanence. Superiority is not absolute; it depends on the case.

• FUE better — large areas: transferring up to 4,500 grafts in one session is practical.
• FUE better — operating time: the same graft count is completed in less time.
• FUE better — very high density targets: channel angle and depth can be set independently.
• DHI better — planting between existing hairs: less contact with healthy follicles because no separate channel is opened.
• DHI better — unshaven work: it is the only method suited to working between long hairs.
• DHI better — time outside the body: the interval between harvesting and placement is shorter.
• Equal — permanence: in both, nape-derived follicles are resistant to shedding.

Is there any difference in healing and crusting?

The healing timeline is the same in both: crusts come away in 10–14 days, shock loss occurs in months 2–4, and the result completes at 12–18 months.

Where channels are opened with a sapphire tip, the incision edges are cleaner and some patients have less swelling in the first days. That is not a superiority of technique but a consequence of channel geometry, and it does not change the final density.

What decides it in the end?

The decision rests on four measurements: the square centimetres of thinning area, follicular unit density in the donor area, whether there is existing hair where grafts will go, and whether you are able to have your head shaved.

A technique cannot be selected without those four figures. Being recommended a single technique before being examined tells you the choice was made to suit the clinic’s workflow rather than your case — and if a clinic only ever does one, that is what you will be offered.

What actually decides how natural the result looks is not the technique but the angle, direction and spacing of the channels. Hair leaves the scalp at 40–45 degrees; get that flow wrong and the result looks artificial whichever technique was used.