It's generally recommended to replace your mouthguard every 1-2 years. However, there are a couple of factors to consider. If you notice any tears, cracks, or signs of wear and tear, it's time for a new one. Similarly, if you're an athlete who participates in frequent, high-impact activities, replacing your mouthguard annually might be a good idea. Even if there's no visible damage, your teeth may shift slightly over time, affecting the fit and protection offered by the mouthguard.