If you have porcelain veneers, you should remember they have a limited lifespan. Even well-maintained ones will only last for a couple of decades or so. As such, you’ll eventually need to replace them to benefit from treatment long-term. Otherwise, you may find yourself with a declining smile that could really use some help. However, knowing the right time isn’t always clear when it comes to replacing veneers. To help you through that obstacle, here are four signs to look for that show you could use replacements.