Tooth structure lost due to cavity, trauma, excessive force in brushing, and parafunctional habits, can be restored with filling materials to their original form and function, when the tooth structure loss is confined to the second layer of a tooth, dentin

Fillings are strictly contraindicated when the tooth structure loss extends to the inner and third layer of the tooth, pulp. Such teeth have to be root canal treated

Fillings are done with transparent and tooth-colour-mimicking materials like composite resin and GIC

Cavities that are detected early and filling that is done in the initial stages of the cavity, tend to last longer