Which has more opportunities for travel/advancement and job openings, dental hygienist or nurse?

I am considering whether to be a nurse or dental hygienist. I realize that being a nurse has more career specialties. Are there also opportunities for advancement as a dental hygienist, such as starting one's own practice or moving into management. Also, are there any "traveling dental hygienist" positions that are paid. Can you join the Peace Corps as a dental hygienist? I really want opportunities, job security, and flexibility in whatever job I choose, but I would also like a pleasant work environment.

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