Filling the gap is generally the use of resin fillings or veneers and other restorations to eliminate the gap between the two teeth, which may lead to hazards such as gingivitis, caries, etc., as follows. 1. Gingivitis: the edge of the filling or restoration is usually placed below the gums for the sake of aesthetics, and the gums may be inflamed under the mechanical stimulation of the filling or restoration and the chemical stimulation of the adhesive. 2. Caries: The resin fillings used for filling gaps may polymerize and shrink after filling, resulting in tiny gaps at the edges, which can be invaded by bacteria to cause caries. There may be other hazards of filling gaps, it is recommended to go to the regular medical institutions, professional treatment with the help of doctors.