As he is aging, sometimes Mick (ESS) is reluctant to eat his evening meal. I checked teeth--even got some dog dentistry tools, including a mirror--to aid in the search for tooth issues. He's 14+ and there was some plaque on his canines and I tried scraping it down. Made me wince and him squirm.
Tried, with some noticeable success, stuff from Petlite "Oral Care Gel," which I basically just rub on his teeth. It's sort of the consistency of not-quite jelled Jello. The bottle I grabbed is peppermint flavor...don't think it makes a difference. I try and keep him from licking it off for the first minute or two. Reduced the plaque a bit--and made him go: "nwargh nwargh nwargh", wondering what inscrutable punishment I'm pursuing now.
I just grabbed this stuff and this brand, but as I recall, there were other brands. I just did it a couple of times a week for a while...not scrupulously...so can't say what a rigid regime would do.
Usually, I just annoy the dog long enough so that by 10 pm, he's hungry enough to eat.
Tinker, GWP, on the other hand, approaches all food like she has never eaten before and this might be her last chance. She's just turned four, so minimal plaque, if any on her teeth.
Best wishes.