If he is willing to wiggle it, try making it fun. Remind him of the tooth fairy and that he will get a surprise. If he ia a heavy sleeper, u can help loosen it while he is asleep.

My son's tooth fell out after he ate some croutons.

does he like apples? or a treat like taffy ???

You can encourage him to wiggle it but you don't really have to do anything. They all fall out eventually - usually when they're eating :)