The kind animal lover of a vet today said Billy's teeth, on a quick inspection, looked not terrifying. What a relief! We both thought they  looked nasty to the max when we looked previously. His enamel is coming off his upper canines but she said nothing about that. Grade 1 or 2 tartar on his back molars, worst on the left side. She recommends a cleaning , exam by specialist and xrays of all mouth. Especially of the surgery of 4 years ago, lower canines.