Clear aligners like CandidPro have become a popular choice for straightening teeth because of its clear, removable aligners and convenient design. However, sometimes patients notice that their aligner doesn’t fit properly. It may feel too tight, not snap fully into place, or leave small gaps between the aligner and teeth. While this can be frustrating, it’s also a common issue—and one that can usually be fixed with the right steps. Here’s what you should do if your Invisalign aligner doesn’t fit.