Dentures that crack intraorally can indicate the begin of potential issues. Even a small crack needs to be fixed by a denturist, as there are dangers to a quick fix solution like super glue. A chemical in super glue, called cyanoacrylate, emits dangerous fumes that can cause flu-like symptoms, irritation to your eyes nose and throat, or could potentially cause asthma when inhaled. It’s important to get a denture crack fixed by a professional. If your dentures are cracked, broken, or a tooth has fallen out, see your denturist first.