If  a single spot on one of your teeth is not cleaned daily, the 
					remaining bacteria will transform themselves into a sticky 
					film substance called plaque. The plaque will produce 
					acids which eat away at the enamel of the tooth and will 
					eventually cause cavities. When the cavity gets through the 
					enamel, into the underlying tooth structure (the dentin), 
					repair or restoration is necessary.
					
					
					If there is sufficient tooth structure remaining after removal of all 
					the caries, a filling is placed. There are three types of fillings commonly used: