home many sessions neede

I am a male with sparse hair on my back. This sparse hair is generally long and thick 9in diameter). What I’m wondering is how many sessions would it take to permanently remove this hair or make it less obvious? I have had one session at 2 different times, years apart, and each time the hair came back as before the treatment.

one treatment would not be enough to do anything other than thin the area treated. If you can’t bare the entire area each and every time you have a session, you can’t make significant progress.

Without seeing you it is not possible to even guess what your treatment needs are.