Composite fillings in Tracy, CA will fill the cavities and seal gaps in a natural-looking manner. Free consultations are offered. Call to schedule today! Composite fillings are usually placed in one appointment or sitting. And while the tooth is still numb, your dentist will remove tooth decay completely. The space will then be thoroughly cleaned, carefully prepared and washed prior to placing the new filling. And if the decay happens to be close to the nerve of the tooth, a special medication will be applied for better and added protection.