Dental filling is the restoration of decayed, broken or cracked teeth with various materials. This method, applied before the decay tissue progresses, prevents complete loss of the tooth. The durability of silver amalgam fillings is between 15-20 years. Gold fillings can be used for an average of 20 to 30 years. The lifespan of composite fillings varies between 7 and 10 years and may need to be replaced after this period.