This is an exciting area where research and development is developing new and improved materials all the time. Ceramic fillings offer enhanced aesthetics and have wear characteristics very similar to tooth enamel. They are also becoming much stronger which allows your dentist to use them in more places. They can even be made while you wait, using CAD-CAM technology.
Ceramic filling involve preparing the tooth, making the ceramic filling - either at a laboratory, or right there and then at the chair-side - then cementing the filling in with strong cement.
They are usually only used in larger cavities.
The gum tolerates ceramic very well, leading to less reaction and so healthier appearance.
Ceramic is not recommended as a filling material in all situations, but your dentist can advise you.