Which hair removal method works by decomposing the papilla?

The method that works by decomposing the papilla is galvanic hair removal. This technique uses an electrolysis process where a low-level electrical current is applied via a needle inserted into the hair follicle. The current interacts with the body's natural saline solution, producing sodium hydroxide, which effectively breaks down and destroys the hair papilla. This is significant because the papilla is the structure that nourishes the hair and is essential for hair growth. By decomposing the papilla, galvanic hair removal aims to achieve permanent hair reduction.

Other methods like laser hair removal and photo-epilation utilize light-based technology to target the pigmentation in the hair, which does not directly damage the papilla. Threading is a mechanical hair removal method that removes hair from the follicle using a twisted thread, but it does not involve any chemical or electrical processes to affect the underlying structures of hair growth.