They can both find work with their degrees and live a comfortable life. A lot of information is missing here.
Yup. The most important being the dental school which he got into.
A state dental school you can do the 4 years at under 100k per year. Private institutions are much costlier, with the schools in NY and LA that mass produce dentists costing 600-750k for the four years. Tbh it's no great achievement to get into those schools since their class size is so large. IMO he should find another career path.