The best way to prevent a broken filling is to attend regular dental checkups. These will allow your dentist to inspect your dental fillings to ensure they are staying strong and effective. For preventing a sudden breakage of your dental filling, we recommend night guards or mouth guards. A night guard can help prevent damage from nighttime teeth grinding (something that can do far more dental damage than a simple broken filling). Mouthguards offer excellent protection against sudden trauma; especially during high-contact events like sports.