A broken denture is fixed by putting the two pieces back together and making a matrix to maintain its original form. Once the matrix is fabricated the broken acrylic areas are ground away and new acrylic is added to restore the denture to its pre-broken state. Please do not use super-glue. Not only is it ineffective at fixing a denture securely, it is toxic and if not glued in the right position can potentially destroy your denture beyond repair.