Based on my recent research on this chair, I find that typically dentist chairs have a low back and two small headrest. This chair has a high back and one headrest which makes me think it is a barbers chair. The headrest on this chair looks to be one piece, but does it fold in half at the middle? I see a line down the middle that may be where it folds. Dentist chairs typically have this hourglass style armrest which this chair has. Barbers chairs typically have a two post style armrest from what I gather. Dentist chairs seem to have more gadgets on them than barbers chairs and this looks to be a simple chair. It looks to be a cross between the two in my opinion. Salon chairs seem to be a little more foo-foo than barber chairs and I don't think this chair is new enough to be the salon period.
