The old debate on the mercury/silver fillings is very contentious. There is an increasing demand for white/ tooth coloured fillings, as the appearance of peoples smile can be dramatically changed. We use both silver fillings and tooth coloured fillings. Fillings are done in the one appointment. There are many indications for each one of them. Many carious/ decayed/ broken down teeth can be restored with white fillings, but there are limitations. As with real estate, location is a main determinant. The next deteminant is the size of the filling that is required. As a rule of thumb: the larger the cavity the better it is to place a silver filling. This may be different for you; a dentist is the only person that can determine that for you.