The claim that "a single session guarantees hair will never grow back" runs contrary to biological reality. IPL (Intense Pulsed Light) can only effectively destroy hair follicles that are currently in the *Anagen* (growth) phase—which typically accounts for only 20–30% of all follicles at any given time—while remaining ineffective against hair in the *Telogen* (resting) phase.
*Anagen* (Growth Phase): The hair follicle is active and rich in melanin, making it the prime target for IPL treatment.
*Catagen* (Regression Phase) & *Telogen* (Resting Phase): The hair follicle is shrinking or dormant, and melanin levels are low; consequently, light energy cannot be effectively absorbed.
Treatment Cycle Design:
**Initiation Phase (Sessions 1–4):** Once every 2 weeks. This targets active, growing hairs; visible results include finer hair texture and a slowed growth rate.
**Consolidation Phase (Sessions 5–8):** Once every 4 weeks. This allows time for dormant (*Telogen*) hairs to transition into the active *Anagen* phase, enabling a second round of elimination.
**Maintenance Phase (After Session 8):** Once every 1–2 months. This targets any sporadic new hair growth that may emerge.
Clinical data indicates that after completing a consistent course of 6 to 8 treatment sessions, hair density can be reduced by 70–90%. Interrupting the treatment process allows dormant hairs to re-enter the active growth phase, thereby undoing the progress achieved thus far.