Both for the lifestyle and money. Because the job is easy and less physically demanding, the orthodontists can see 60-80 patients a day, work more days a week, and work more years (until they are 70+ yo) than general dentists and other specialists. High patient volume per day + more work days per weeks + more years of pratice = more $$$. Low chance of getting sued + good work hours + mostly young healthy friendly patients = the best work-life balance job.
There are plenty of jobs available. The question is how picky are you. If you don't mind working for the GPs, traveling to multiple offices, working on the weekends, working at low tech offices etc, you will do very well.....it's still a lot easier than working as a GP.......and a $5-600k student loan shouldn't be an issue.
I am working at the corp office right now. My shift is from 7am-3pm. There are 7 starts on the appoint book and yet, I still have plenty of time to type this post. Since it's a good production day, the office manager buys us lunch today. Easy job...good bonus ($75 per start).....and free food....I love my job.