If you have a cavity you need to get a dental filling to prevent further tooth deterioration. There are different types of fillings that vary in materials and their appearance.
Composite fillings are the most commonly used fillings in today's dentistry. They also called tooth-coloured or white fillings as they closely resemble your natural teeth colour, which makes them popular. Porcelain is a very strong material.
Amalgam or metal fillings are common type of filling used in Canada. Amalgam material has been used in dentistry for the past 150 years however it's use is on the decline for couple of reasons. The main reason is that aesthetically it is not as appealing as white or tooth coloured filling. Second reason is that some patients becoming concerned with a small amount of mercury in amalgam fillings.