I'd suggest seeing a holistic vet. Mine is amazing, supports my raw feeding, will do titers vs vaccines if requested, uses recumbent vaccines. Treats holistic with supplements etc. and only medication when absolutely necessary.

Unfortunately there is probably little way around a dental. You can try and chip the tarter off with a nail, but considering the condition teeth may need to be extracted that you would not be able to see. They also offer dental X-ray in veterinary practice. Once you get them back to a good condition. You can use raw marrow bones and raw chicken, duck or Turkey necks on a regular basis to try and maintain them. Although genetically some dogs/cats are just predisposed to having bad teeth.

Hope that helps