[anonymously]

Have your regular vet examine her teeth and make recommendations. The anesthesia is safer nowadays than it used to be. The vet will want to do lab work to rule out medical issues first.
After cleaning and extractions (if any), get some dog toothpaste and a medium brush, see YouTube for how to videos, start brushing her teeth once a day.
Of course, give her mouth a few days to heal first.
The chews and additives are just breath fresheners, at best. It is the scrubbing motion with a brush that helps prevent tartar and plaque buildup.

PS: Don’t be fooled by “No Anesthesia” cleaning/polishing services…..it’s cosmetic and doesn’t address under the gum line where trouble could be brewing.