GPR/AEGD are postdoctoral programmes, still, not specialities. The scope and content of postdoctoral general dentistry programs differ from institution to institution throughout the US. Some are hospital based (general practice residencies or GPR) and others are clinic or community based (advanced education in general dentistry or AEGD).
In many instances, institutions offer residency programs, which have elements of both the GPR and AEGD.
In ninety-five percent of the postdoctoral programs, residents are salaried, health and medical malpractice insurance are covered, and dental school loans are deferred.
Good things about GPR/AEGD.
1) No tuition fee, most of the instances you will get stipend too.
2) After 2 years of training you can apply for license in some states
3) You will get hands on clinical training, which helps a lot than doing classroom speciality training.
Tips for lazy bums:
1) Do a search for the programmes which accept non Us citizens/ permanent residents and foreign trained dentists at PASS, participating post doctoral programmes.
http://www.adea.org/PASS/default.htm
Few hospitals/schools accept foreign trained dentists, apply to them.
Most of them are 1 year but 2-year programmes too exist. If you have two year GPR/AEGD you can apply for license in some states, what they want is not training in speciality, but minimum 2 years of clinical training at the school (hospital at which applicant met the same level of scientific knowledge and clinical competence as all graduates from that school/hospital. The 2-year clinical training shall consist of 2850 clock hours complete in 2 academic years for full time applicants. (These are exact words from Illinois dental board).
2) You can find here the links to all state boards in one page.
http://www.aadexam.org/links.htm