Very to not at all
For the right woman, it works great.
Dark hair, light skin and tolerance to the treatment are all good signs that it will work. Lighter hair and darker skin make it harder, but not impossible....More treatments. Bikini, underarms, nipples, happy trail all work well. Facial hair is more resistant. Good equipment helps a lot. We estimate a 60-90% reduction after 5 treatments space 6 wks apart.