Concise answer
Laser is more accurately described as long-term hair reduction. Response and maintenance vary by hair type, skin type, area and hormonal factors.
Coarse pigmented hair usually provides a clearer laser target than fine or light hair.
New or hormonally stimulated hair can appear even after a good initial response.
When evaluation may help
A consultation should assess device suitability, skin type, expectations and any sudden or hormonally associated hair growth.