Dental implants can be used to retain dentures or to replace dentures

Implant overdentures.  4-6 implants can be placed in the jaw and a denture can be modified to snap on and off of the implants.

A fixed-detachable full arch restoration is an alternative to an overdenture.  Acrylic or porcelain teeth can be secured to the implants for a  non-removable full arch tooth replacement solution. 

Alternatives to implants include traditional dentures and dental bridges.  The video explained the negative aspects of these alternatives.