Having missing teeth and thinking what you can do to bring back your old smile back? Don't worry, with modern techniques, it is now possible to have your smile back. One of the way to do this is with the help of dentures. Usually people need dentures in below cases: 1. Loss of teeth due to some accident or fight: Accidents happens in life, and we don't have control over it. But some accidents leave a significant effect on our life by affecting some part our body permanently.