DHI hair transplant with the Choi pen, explained

DHI (direct hair implantation) is a hair transplant technique in which each graft is loaded into a Choi implanter pen that creates the opening and places the graft in a single motion. The extraction step is the same as FUE; what changes is how the grafts go in.

DHI starts the same way as FUE

Follicles are harvested one by one from the back and sides of your scalp with a fine punch, exactly as in FUE. That means no strip and no linear scar. The difference comes in the implantation phase, where DHI skips the separate step of opening channels in advance.

The Choi pen opens the channel and places the graft at once

A Choi pen is a slim implanter with a hollow needle at its tip. A team member loads a single graft into the needle, the surgeon inserts it into the scalp at the planned angle and depth, and a plunger releases the graft as the pen is withdrawn. Several pens are usually loaded in rotation so the work can keep moving.

DHI's main strength is precise control

• The surgeon controls the angle, depth, and direction of each graft as it is placed.
• That control is often useful for hairlines, where the first rows need to look soft and natural.
• It is also useful for dense packing in targeted zones.
• DHI is sometimes used to place grafts between existing hairs; your surgeon tells you whether your plan requires shaving the recipient area.

DHI has trade-offs, so it isn't always the right choice

Placing grafts one at a time with a pen is meticulous work that relies on an experienced team, and it can be slower for very large areas. That's why many plans combine techniques, using DHI where precision matters most and Sapphire FUE where broader coverage is needed. Neither technique is automatically better; the right mix depends on your hair, your donor supply, and the area being treated.

Recovery after DHI follows the familiar timeline

Recovery after DHI follows the same general pattern as other FUE-based procedures. Most people return to desk work within about 5 to 7 days, the transplanted hairs shed around weeks 2 to 4, new growth begins around months 3 to 4, and the final result settles at 12 to 18 months. Every patient heals differently, and your surgeon gives you a personalized aftercare plan.

Wondering whether DHI fits your hairline? Start with our free AI analysis, and your surgeon will confirm the technique at consultation.