DHI (Direct Hair Implantation) is widely considered the most advanced hair transplant technique available today. At Este Leon Clinic in Istanbul, DHI using the Choi implanter pen — what we call Pen DHI — is our signature method, and it forms the foundation of everything we do.
This guide covers everything: how DHI works step by step, what makes it superior to conventional FUE, who the ideal candidate is, and why the one-patient-per-day model matters more for DHI than any other technique.
Key takeaway: DHI produces denser, more natural results than conventional FUE because grafts spend less time outside the body and implantation direction is surgeon-controlled. The Choi pen is the tool that makes this possible.
What Is DHI Hair Transplant?
DHI stands for Direct Hair Implantation. Unlike standard FUE, where the surgeon first creates hundreds of tiny recipient channels in the scalp and then places grafts into them separately, DHI combines both steps into one continuous motion using the Choi implanter pen.
The Choi pen is a hollow needle attached to a small barrel. The technician loads a single graft into the pen, and the surgeon then inserts, angles, and places it directly into the scalp in a single movement — simultaneously creating the channel and implanting the graft.
This distinction has profound consequences for your result.
How the Choi Implanter Pen Works
Step 1: Extraction
Individual follicular units (grafts) are extracted from the donor area at the back of the scalp using a micro-punch tool, typically 0.7–0.9mm in diameter. At Este Leon, we use sapphire-tipped punches for cleaner extraction and minimal scarring.
Step 2: Loading the Pen
Extracted grafts are carefully loaded into Choi pens. Each pen holds one graft. A team of trained technicians loads pens in rotation so the surgeon always has a charged pen ready — minimising the time any graft spends outside the body.
Step 3: Simultaneous Implantation
The surgeon presses the pen tip against the scalp at a precise angle, depth and direction — then deploys the graft with a single controlled push. No pre-made channels. No second handling of the graft. No delay between channel creation and placement.
A full procedure involves between 2,000 and 5,000 individual graft placements, each requiring surgeon judgement on angle and direction to produce a natural-looking result.
DHI vs FUE: Key Differences
| Factor | Conventional FUE | DHI (Pen Implantation) |
|---|---|---|
| Channel creation | Separate step (before grafts) | Simultaneous with implantation |
| Graft handling | Placed by forceps after channels | Loaded once, placed directly |
| Time outside body | Longer (channels made first) | Shorter (minimises trauma) |
| Density achievable | Good | Superior |
| Hairline naturalness | Good | Very high precision |
| Shaving required | Usually full shave | Often no shave (DHI advantage) |
| Healing speed | Standard | Faster (fewer trauma points) |
| Skill ceiling | Moderate | Higher (surgeon-dependent) |
The no-shave advantage: Because DHI does not require pre-made channels, it is often possible to perform procedures in the recipient area without shaving — critical for patients who want to keep their hair transplant private.
Why Graft Survival Time Matters
Every minute a follicular unit spends outside the body reduces its viability. Grafts are living tissue — they need to be at body temperature, properly hydrated, and implanted as quickly as possible after extraction.
In a standard FUE procedure treating multiple patients, grafts may sit in solution for several hours while channels are made for one patient, then another. In a DHI procedure with a well-coordinated team, the extraction-to-implantation pipeline is near-continuous.
This is one of the key reasons Este Leon's one-patient-per-day model is not just a marketing phrase — it is a clinical decision. When a surgeon is focused on one patient, graft handling is continuous, precise, and optimal. The result is measurably better graft survival.
Este Leon's Pen DHI Technique
Our approach goes beyond standard DHI in several ways:
- Sapphire micro-punch extraction — smoother edges, less follicle trauma, faster donor healing
- Multi-pen rotation system — technicians keep pens loaded in a continuous cycle so the surgeon never pauses between placements
- Surgeon-controlled angle map — every hairline graft is placed at the exact angle of natural hair growth for that patient's unique pattern
- Maximum graft density — because one surgeon focuses all attention on one patient, graft placement density reaches its true ceiling
Stem Cell DHI: The Premium Protocol
Este Leon also offers Stem Cell DHI — our highest-tier protocol. Before implantation, grafts are treated with a PRP (platelet-rich plasma) solution enriched with growth factors derived from the patient's own blood. This stimulates follicle activity, reduces transplant shock, and maximises the percentage of grafts that survive and produce hair.
Stem Cell DHI is particularly recommended for patients with:
- Advanced hair loss (Norwood 5–7)
- History of poor healing or thin skin
- Desire for maximum density from fewer sessions
- Eyebrow or beard transplant (where graft counts are small but precision is everything)
Who Is a Good DHI Candidate?
DHI is suitable for most hair transplant candidates, but it is the best choice if you:
- Want maximum density in the recipient area
- Need a very natural hairline (the front zone, where angle precision matters most)
- Prefer to keep some hair length through the procedure (no-shave option)
- Have had a previous transplant and want to increase density (DHI can implant between existing hairs)
- Are having an eyebrow or beard transplant
DHI is generally less suitable for very large graft sessions (5,000+) where Sapphire FUE may be faster. In these cases, Este Leon's team will recommend the optimal technique or a combination approach during your consultation.
DHI Recovery Timeline
Recovery after DHI is typically faster than conventional FUE because there are fewer trauma points and no pre-made channels to heal. Here is what to expect:
- Days 1–3: Mild swelling and redness. Small crusts form around grafts. Sleep elevated.
- Days 4–10: Crusts shed naturally. Recipient area looks slightly pink. Avoid touching.
- Weeks 2–4: Most redness resolves. Hair in grafted area may start to shed — this is normal.
- Months 1–3: Shock loss phase. Transplanted and some surrounding hairs fall. The follicles are resting, not dying.
- Months 3–5: New hair begins emerging. Fine, soft initially.
- Months 6–8: Noticeable density improvement. Hair thickens and darkens.
- Months 10–12: Final result. Este Leon's guarantee assessment takes place at 12 months.
How Many Grafts Do I Need?
Graft requirements depend on the extent of hair loss, donor density, and desired coverage. As a rough guide:
- Norwood 2–3 (early thinning): 1,500–2,500 grafts
- Norwood 3–4 (moderate loss): 2,500–3,500 grafts
- Norwood 4–5 (significant loss): 3,500–4,500 grafts
- Norwood 5–7 (advanced loss): 4,500–6,000 grafts (may require two sessions)
- Eyebrow transplant: 200–600 grafts per eyebrow
- Beard transplant: 500–2,500 grafts
Este Leon provides a precise written graft count during your pre-procedure consultation — not a vague range, but a specific number based on your donor density and coverage goal.
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Is DHI more expensive than FUE?
DHI typically costs 10–20% more than FUE because it requires more precision, more pens, and longer procedure time. However, the superior density and natural results justify this premium for most patients.
Can DHI be done without shaving?
Yes — this is one of DHI's most valued advantages. Because no channels are pre-cut, the hair around the recipient area can be left at length. The implanted hairs will be trimmed, but surrounding hair remains intact. Este Leon offers no-shave DHI for suitable candidates.
How long does a DHI procedure take?
A typical DHI session at Este Leon takes 6–9 hours for 2,500–4,000 grafts. This is one of the reasons we only treat one patient per day — it is a full-day commitment from our surgical team.
Is DHI permanent?
Yes. DHI grafts are taken from the permanent zone at the back of the scalp — hair follicles that are genetically resistant to DHT (the hormone responsible for pattern baldness). Once successfully transplanted, these grafts retain their donor characteristics and continue growing for life.
What is the difference between DHI and Sapphire FUE?
Sapphire FUE uses sapphire-tipped blades to create micro-channels, then places grafts separately. DHI skips the channel step entirely, using the Choi pen to implant directly. DHI tends to produce higher density; Sapphire FUE can be faster for very large sessions.