This was the Tri-Service Defence Dental Centre at Aldershot. I spend two konths shooting all aspects of Military dentistry (including reconstructive surgery on battlefield casualties) for a booklet put out by the DDA. In addition to Aldershot, I also went to Haslar near Gosport (before it closed) to do the surgical stuff...
Spookily, some of the dentists working for the MoD are Harley Street consultants - you'd be amazed at how many 'Big Name' surgeons work for the military - 'keeping current' as one put it...