Some consumers have experienced permanent hair reduction, but there is limited data on how long hair reduction usually lasts, how much hair reduction is typical, and how often permanent hair reduction occurs.
Long-term data on safety and effectiveness have not been accurately established.
Response rates have not been established.
Regrowth rates have not been accurately established and cannot be predicted due to numerous variables.
Generally not as effective on unpigmented (gray) hairs and red or blonde hair.
Must be used very cautiously (if at all) on darker skin tones or on consumers who tan themselves.
Improper treatment can cause burns, lesions, skin discoloration lasting several months, or patchy/patterned regrowth.
Recent data suggest other skin structures are often affected by laser irradiation, and long term effects of this constitute an unknown risk.
Requires eye protection.
Can be expensive.
Some find treatment painful.
Regulation varies by state, so inadequate controls exist to ensure competent practitioners.
Some consumers, even ideal candidates, do not respond to treatment.