There are very few people who manage to avoid having a cavity at some point during their life. If you're like the majority of people, you probably have experienced a cavity. A cavity typically calls for your dentist to remove the decay and fill in the tooth area that was removed with a composite material in order to prevent further decay and strengthen the affected tooth; this treatment is called a filling. There have been lots of advances in modern dentistry that make this process much more comfortable and use materials that are safer and more aesthetically pleasing.
Many people do not like the appearance of silver fillings in molars because of the dark color. Silver fillings can be replaced with composite fillings that are durable and match the color of the natural teeth.
Tooth fillings colored to look like a natural tooth are known as Composite Resin Dental Fillings. These fillings were created as an alternative to traditional metal dental fillings and are made of plastic dental resin combined with porcelain and glass particles. These types of fillings are durable and much more natural looking than amalgam fillings.
(Depending on the extent of the decay, proper treatment for the cavity might actually require placement of a crown instead of a filling to preserve the integrity of the tooth. Your dentist would be able to asses the amount of decay and recommend the most appropriate treatment plan for the decay.)