The galvanic modality effects permanent hair removal by

• A. Heating
• B. Chemical decomposition
• C. Pulsed light
• D. Mechanical removal

Answer: (B)

Galvanic electrolysis removes hair permanently through chemical decomposition of the follicle tissue. When direct current is applied, electrochemical reactions occur in the follicle fluids, producing alkaline compounds such as sodium hydroxide. This caustic environment breaks down the follicle tissues, destroying the hair follicle and preventing regrowth. Heating is not the mechanism here—that would be thermolysis. Pulsed light works via light energy absorbed by pigment to heat the follicle, and mechanical removal simply plucks hair without damaging the follicle.