A Filling (Restoration) is the name of a dental procedure in which a Bio-Compatible material is used to treat a decayed (cavitated) tooth. This material is placed into the tooth where it repairs the damage and replaces the natural lost tooth structure.
The traditional type of filling is of silver amalgam which has got a long life but is not aesthetically pleasant. Newer Composite is a Tooth colored Filling material which matches with the colour of the tooth. Also there have been questions regarding the safety of silver amalgam fillings due to their mercury content.
Apart from filling dental cavities, composites can also be used for replacing old and damaged silver fillings, repairing broken or fractured teeth, closing gaps between the teeth and smile makeovers (veneers) to make you look glorious.