There is no harm having them checked at times like for vaccinations, but it's not worth getting it done unless you know your bun has a problem, or if you suspect a problem.
I have 10 dental bunnies but only one ever gets problems with food, it is possible to pick it up before then if you get to know their behaviour and how their tummy feels. When it feels doughy then the gut is slowing down, and for most of mine that means they need a dental because they are eating less hay (which is not always obvious to me). The sooner it is picked up and sorted, the less damage it generally does to the mouth and the surrounding teeth which would hopefully mean no further complex problems arise from it, such as abscesses.