Old versus new
The oldest type of dental filling is an amalgam filling. It’s probably what you imagine when you think of a filling. An amalgam filling is a mix of metals, usually about 50% mercury, which binds the others together. When it’s first placed in your tooth it looks silver; over time it darkens. 
A composite filling is made of a compound of ceramic and plastic. These are sometimes called “tooth-colored” fillings because they blend in and aren’t as noticeable as amalgam fillings. 
Preserving as much tooth as possible
Composite fillings are more flexible, which means they can be better molded to fit your tooth. The result is less need for drilling, and preservation of more of your natural tooth. 
Better bonding
Whatever type of filling you have needs to bond to your tooth so that it stays put. Composite fillings bond at a micro-level to your natural tooth, and that bonding provides additional support. 
Appearances matter
Your smile is one of the first things people notice about you, and composite fillings simply look better than amalgam fillings. If your cavity is in a tooth that is clearly visible when you smile, we strongly recommend a composite filling. 
When your smile is bright and attractive, you project a self-confident, pleasant demeanor. Composite fillings can help you feel better about yourself and reflect your personality more accurately. 
A mercury-free mouth
The FDA has cleared the use of mercury in fillings, and there’s no evidence that an amalgam filling causes mercury poisoning. However, some people are allergic to the metals in amalgam fillings, and some people would simply prefer to not have mercury in their mouths. 
Composite fillings are safer if you have allergies, and thanks to their ceramic base, you won’t have any mercury to worry about. 

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