If you had cavities as a child or a young adult more than likely the material used was amalgam which appears silver in color and contains a mixture of silver, copper, and tin. Amalgams also contain mercury which over time can corrode, leak, and cause stains to the existing teeth.
Although they were the best materials back then, advances in technology have proven to increase the strength, function, and appearance of these restorations. If your cavity is small and caught early, chances are Dr. Park will use a tooth-colored composite resin to restore the tooth. This composite is stronger and lasts longer than silver-mercury fillings and is far more attractive.
Resin (Composite) Restorations