"What does that violet glass comb actually do, does it shock the scalp, and how does it help itchiness?"
The glass comb does not deliver an electric shock. Inside the sealed glass electrode is inert argon gas. When excited by mild alternating current at 100,000 to 250,000 Hertz, the gas emits a calm violet glow and ionizes ambient oxygen at the glass surface into transient enriched ozone (O3).
As our esthetician guides the raking tines through your parted hair, this gentle ozone contact disinfects follicular openings, moderates microbial imbalance associated with flaking, and stimulates cutaneous capillaries. Clients feel only a mild, soothing tingling sensation accompanied by a clean, fresh-air scent. It is followed immediately by an acupressure scalp massage using pure jojoba and squalane lipids to prevent post-treatment tightness.