Bioaesthetic restorative dentistry deals with the restoration of the structure of the tooth when it is worn out due to injury or caries (tooth decay). This is done using fillings when the damage is minor, with an onlay and with a full-coverage crown when the damage is extensive. In this way, the insulation of the inside of the tooth from germs and its structural strength is restored so that it can withstand the masticatory loads. The restorative materials in their application are in any case anatomically and aesthetically harmonized with the natural environment of the mouth and completely biocompatible with the adjacent tissues (gums, jaw bone). Hence the term bioaesthetics.