Hair treatments cost $130 on average.
A hair treatment appointment takes about 75 minutes on average.
Most treatments provide a balance of protein (for strength) and moisture (for softness). Your needs will vary - if your hair is overprocessed and porous, you're going to want that protein. Have a word with your hairdresser and see what's what.
If you're feeling a bit frizzy, or dry, or brittle, a hair treatment could do you a world of good. They're particularly handy if you've got colour-treated hair, or any other kind of chemical enhancement going on.
Chat to your hairdresser on this one - you may end up needing one every time you go to the salon, or every other visit. For truly stressed hair, you'll want to be following up at home yourself once or twice a week.