Traditional dental fillings, are most often made of silver amalgam. The strength and durability of amalgam fillings make it useful for situations where restored teeth must withstand extreme forces that result from chewing, often in the back of the mouth.
Composite also known as Resin Fillings
Newer dental fillings are made with plastic that look like your natural teeth. These are often called composite fillings. Composite fillings are usually used on the front teeth where a natural appearance is important, but they can also be used on the back teeth depending on the location and extent of the tooth decay.