OH regularly cleans and de-scales Ellie's teeth with a de-scaling tool. He used to do this for our last cocker Sophie. She lived until she was 14 and when and I took her for her boosters, etc., particularly when she was older, if it was a different vet they used to look in her mouth, look at me, look back in her mouth, then check her records to see if she had been in there to have her teeth cleaned, then look back at her teeth, then look back at me and ask 'do you clean her teeth'. We went through this several times.
Her teeth were pearly white with no tartar build up right until she died. Mind you, OH is fanatical about his own teeth. He can't eat anything at all without flossing and he treats Ellie's teeth similar to his own.