Pay your bill on time. If you’re in the US, you’ve paid them for an hour’s worth of work what you might make in a day or a week or a month. (Or they were paid that between you and your insurance.) They’re good.

If you’re not in the US… same as anyone, I suppose. Start with a well-written note (like in a card). Unless you’re in a third-world country, I still think dentists and their assistants are paid well. So a gift card might not be so well received. Flowers are often linked to romance, and chocolates are the same and kind of go against the spirit of clean teeth. One of the best gifts is something more personal that they’re not likely to think of. That’s harder. Something from your life, your interests, that will remind them of you. Think of it like a video game and a quest reward. It’s fine to get a sack of gold coins, but it’s cool when it’s something you can decorate your home or office with that reminds you of the quest. Well, I’m a gamer so I think like that. I’m coming up short on examples, though. The best personal gifts require a lot of thought, but, I think once you come up with something, it’ll click and you’ll know it’s right.