Dental hygienist here. I love my job, but it has its hazards. I can't compare it to the other one you're considering, but I do agree that burnout is a risk of D. H.
Here is my situation and I'll tell you how I prevent burnout. I'll try to be brief!!
I graduated at age 37 in 1997. I decided I would work only as a temp, until and unless I met a dentist I could really trust.
On one temp job I encountered a whole bunch of well-cared for patients! Very small fillings, crowns 10-20 years old, some with meticulous gumline patches, gold inlays and onlays on about 30 % of the people. Well maintained. The second day there I saw the same thing, and I also found the doc was nice, really cheerful and pleasant, staff had been there a long time and they didn't need anybody. I dropped my resume off there in case of future need.
To shorten the story, I have worked there since 1997, perm since '98.
Nice job, but I had back/neck/elbow pain in 1999 and 2000. Hadn't found Cathe yet! At the end of 2000 I broke my heel bone, and when the cast came off I started back gently doing old Firm tapes, then Cathe. (See my fitness page; link at bottom)
Not only fitness, but I also bought some equipment. In 2001 I bought a pair of binocular magnifying glasses and later replaced them with through-the-lens mags in prescription lenses (so I don't have to wear my contact lenses to work). These enable me to see very well while still sitting up straight.
I also bought a piezo scaler (Satelec Suprasson PMax Lux) which has a fiber optic light at the tip. I can practically see around corners with it. The tips are thin and I hardly use hand instruments at all, yet I can do an even more thorough job with more patient comfort (than hand inst or magneto scaler or both).
The glasses cost $1000 and the scaler cost $2000, but they were worth every penny! Now I have no pain, so I can really concentrate on my patients. Work is very satisfying because I see the results of my work. Also I get to see a lot of the same people over years and I feel very connected to community.
I am very happy. I work 4 days a week and my husband basically stays home with our son and keeps him on track and keeps everything together. It works very well for us.
Good luck in your decision!
http://www.geocities.com/ciaobella98765/Fitness.html
-Connie