I’d keep supplements simple: vitamin D3, K2, and magnesium helped my gums a lot, and chewing xylitol gum cut down my funky breath. Oil pulling with coconut oil worked better than I expected too. For the bigger stuff, I once sorted out some overdue dental work through https://www.colinadental.com/costa-rica-dental-procedures-prices/ and the prices made the whole thing way less scary.