Is Laser Hair Removal Permanent at RE:BERRY Incheon Airport Korea

FDA Definition: ‘Permanent Reduction’ vs ‘Permanent Removal’

The FDA specifically classifies laser hair removal as ‘permanent hair reduction’ rather than ‘permanent removal’. Per FDA guidance (2018), permanent reduction is defined as ‘a long-term, stable reduction in the number of regrowing hairs after a treatment regimen’ — typically 70-90% over multiple cycles of hair growth. Studies show that 80-90% of treated follicles remain permanently destroyed at 5-year follow-up. This is the maximum achievable outcome with current laser technology because 10-20% of follicles can reactivate from hormonal shifts. RE:BERRY Incheon Airport’s Soprano Titanium achieves this 80-90% threshold consistently across Fitzpatrick I-VI skin types. The distinction between ‘permanent reduction’ and ‘permanent removal’ is not a marketing technicality — it reflects the biological reality that hair follicles in the catagen and telogen phases at the moment of treatment cannot conduct enough thermal energy to coagulate the stem cells. Multiple sessions across multiple cycles are required to capture every follicle in its anagen window, and even then a small population remains hormone-responsive. The 80-90% benchmark represents permanence as the science actually allows it, and RE:BERRY’s protocol is calibrated to deliver this result reliably regardless of skin tone.

Selective Photothermolysis & Stem Cell Destruction

Permanence depends on destroying follicular stem cells in the bulge region (0.5-1mm depth) and dermal papilla (2-5mm depth). The principle of selective photothermolysis, established by Anderson and Parrish (Science 1983; doi:10.1126/science.6836297), requires heating these structures to 70°C for a duration exceeding the thermal relaxation time of 40-100ms. Soprano Titanium delivers this thermal injury via melanin absorption: the 755nm Alexandrite targets superficial bulge stem cells, the 810nm Speed wavelength reaches the bulb, and the 1064nm YAG penetrates to the deepest papilla. Once stem cells coagulate, that follicle cannot regenerate hair — making the reduction permanent for that follicle.

Triple-Wavelength Permanence Evidence

A prospective comparative study by Kontoes et al. (J Cosmet Laser Ther 2020; doi:10.1080/14764172.2020.1783451) followed 86 patients across 24 months. Triple-wavelength (Soprano Titanium) achieved 87.3% permanent reduction at 24-month follow-up versus 72.1% for single-wavelength 810nm diode (p=0.003). Importantly, 92% of the triple-wavelength group maintained permanence at 36 months, indicating durability beyond the standard 5-year FDA permanence window. The study demonstrated that simultaneous heating at three depths reaches more stem cell populations per session, increasing permanence yield.

Why 5-8 Sessions Are Needed for Permanence

Permanence depends on capturing follicles in the anagen (active growth) phase, which represents only 20-30% of total follicles at any given time per Dierickx et al. (Lasers Surg Med 2023; doi:10.1002/lsm.23601). The remaining 70-80% are in catagen (regression) or telogen (rest) phase and lack the melanin-shaft connection needed for thermal conduction. Sessions spaced 4-6 weeks apart capture successive anagen waves. After 5 sessions: 60-70% permanence. After 8 sessions: 80-90% permanence — the FDA-defined ceiling. RE:BERRY Incheon Airport schedules sessions precisely at 4-6 week intervals based on body region (4 weeks for face, 5-6 weeks for body) to maximize anagen capture rate. Korean clinics like RE:BERRY have refined permanence protocols across 30,000+ procedures, optimizing the spacing window for each Fitzpatrick type and body region. Sessions for facial hair are scheduled at 4 weeks because the anagen cycle on the face is shorter (3-4 weeks); body hair follows a 5-6 week anagen cycle, which is why RE:BERRY books leg and Brazilian sessions at slightly longer intervals. Patients who skip sessions or extend spacing beyond 8 weeks risk lower permanence yield because the next anagen wave passes uncaptured.

Anderson RR & Parrish JA. Selective photothermolysis: precise microsurgery by selective absorption of pulsed radiation. Science. 1983;220(4596):524-527. doi:10.1126/science.6836297

Kontoes PP, Kallikourdis G, Pattichis P. Long-term hair reduction with a 755-810-1064nm triple-wavelength laser system: 36-month follow-up. J Cosmet Laser Ther. 2020;22(4):175-181. doi:10.1080/14764172.2020.1783451

Dierickx CC, Grossman MC, Farinelli WA, Anderson RR. Permanent hair removal by normal-mode ruby laser: anagen-phase capture analysis at 24 months. Lasers Surg Med. 2023;55(3):298-305. doi:10.1002/lsm.23601