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There are sevearl things missing from this question: boards can be re-taken. Of course, tehre are other fields in dental health care besides being a dentist: being a dental technician, a hygienist, etc are otehr options. The curriculum in dental school include a lot of credits that would be a valuable investment in other health care fields: an MD program, nursing, medical technician schools, etc.
We can talk more on all these topics if you would like, but the questions needs in my opinion lots more specificity.