Prosth IMO is an amazing specialty, but it's important that you recognize the following now:
1. Prosth requires a ridiculously high amount of branding + self-motivation to succeed.
2. Prosth can do virtually any major rehab procedure start-to-finish. They can take a patient from broken down/edentulous/hopeless condition to amazing cosmetic and functional results.
3. 99% of patients won't be able to pay the $50K+ it takes to afford your services, limiting your demographic and regional opportunities to work (eg. the most saturated lucrative areas occupied by GPs and cosmetic dentists).
4. The dental community won't be clamoring to refer to you. Cosmetic dentists, advanced GPs, other specialities can easily work together providing comprehensive treatment directions for a patient's needs without ever sending it off to you.
5. Prosth residency is 3 years tuition for procedures and techniques you could eventually learn in CE. This is why many advanced GPs can provide good results for people that may not be up to a Prosth's caliber, but the patient doesn't know that.
6. You come out of Prosth extremely knowledgable and seasoned, but oftentimes the grunt lab skills you've learned won't be carried over to private practice due to time + cost considerations on your part.
7. Be prepared to advertise yourself constantly in social media. Your work is extremely driven by visual branding. Patients don't even know what a Prosth is compared to other mainstream dental providers they may see regularly. You'd have to be super aggressive in Instagram/Facebook to separate yourself in a dental community. No other dental career requires the amount of branding a Prosthodontist requires to make ends meet.
8. If you're not working corporate, be prepared for potential lean periods of business growth. The academic realm being a faculty member is pretty much a requisite for any Prosthodontist even if they're working on the outside. Push to work in a small dental group of providers to keep everything in-house.
By far, Prosth is both the Riskiest and Most Rewarding (financially) out of the career moves in dentistry and that won't be changing anytime soon.