A little trick is to place a piece of shrimp in a hole in a rock to where it could just barely get at it. It will scrape its teeth while trying to dig the piece out. Not a guarantee it will work, but has on some in the past. Also you can put shrimp in empty hermit shells. That works most of the time. Puffer will chew and crack shell to get shrimp. And then there is always just trimming their teeth. It’s very simple and involves some tea tree oil (tiny amount) and trimmers. The tea tree oil is like a ruffi and puts them in a daze for a bit. There are tons of videos showing how to do it. For the amount of oil per gallon, I would have to go dig my notebook out. Haven’t had to trim any teeth in a few years lol. Snails breed like mad in my other tanks, so they either starve or become puffer food.
