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Advantages The chief advantage of composite fillings is their natural tooth color.  Your dentist can blend the composite to match virtually any tooth shade. The amount of tooth structure removed is far less with composite fillings.  Amalgams required that the cavity be undercut to hold the amalgam in place.  The composite filling adheres to the tooth, making a smaller depression possible. Composite fillings can actually improve the strength of a tooth with significant decay.  The composite resin adheres to the tooth and helps to hold it together.  Large amalgam fillings can expand and contract with heat and cold, compromising tooth strength.  In addition, they do not adhere to the tooth material. It is much more difficult for decay to get under a composite filling because of this adhesion.  With amalgam fillings, shrinkage often took place giving bacteria a pathway under the filling. Composite resins are environmentally safe and eliminate the possibility of mercury allergies, or having to dispose of mercury.