When you develop a cavity, your dentist will remove the decay from your tooth and use a filling to cover or 'fill' the area where the decayed material was.
Traditionally, fillings were a silver-coloured material, known as amalgam, that were quite visible in contrast to the shade of a natural tooth. Over time, other options were developed, one of which was composite.
Composite fillings are a tooth-coloured mix of plastic and ceramic, making them an excellent option for teeth that are exposed or visible when you talk or smile.