Tooth-colored fillings: cavities repaired without metal
Composite resin fillings match the natural color of the tooth, bond to the enamel for added strength, and avoid the mercury content of older silver amalgam fillings. The standard restorative choice for most pediatric cavities at our practice.
How a filling repairs a cavity
A cavity is an area of tooth structure that has been destroyed by acid produced by oral bacteria. The bacteria feed on sugars and produce acid as a metabolic byproduct, and the acid demineralizes enamel and underlying dentin until a hole forms. Once a cavity has formed, the tooth structure is gone and cannot regrow.
A filling restores the missing structure. The dentist removes the decayed tissue, prepares the cavity for the filling material, and bonds or packs the restorative material into the space. The result is a tooth that functions like a healthy tooth: the bite force is supported, the chewing surface is restored, and the cavity is sealed off from further bacterial attack.
For most pediatric cavities, we use composite resin (the tooth-colored material). The composite is bonded to the surrounding enamel, which strengthens the tooth and reduces the chance of fracture compared to older non-bonded materials. The shade is matched to the natural tooth so the filling is barely visible.
Composite resin versus silver amalgam
For decades, silver amalgam was the standard filling material because it was durable, easy to place, and inexpensive. The downside is that silver amalgam contains mercury, which has raised health and environmental concerns over time. Even though the American Dental Association considers amalgam safe at the levels used in dentistry, the FDA in 2020 issued a recommendation against amalgam in children, pregnant women, and certain medical conditions.
We use composite resin (tooth-colored material) for nearly all pediatric fillings. The benefits include cosmetic appearance, bonding to the tooth structure for added strength, no mercury content, and no thermal expansion issues that can stress the surrounding tooth over time. The trade-offs are slightly higher cost and slightly more technique sensitivity at placement.
For most pediatric cavities, composite is the right answer. For very large posterior cavities in primary molars where bite forces are high and the child is too young for substantial cooperation, a stainless steel or zirconia crown is sometimes a better long-term answer than a large filling.
The pediatric filling appointment step by step
- The tooth and surrounding gum are numbed with topical anesthetic gel followed by a local anesthetic injection. We use the smallest needles available and patient-friendly delivery technique to minimize the sensation. Most children handle this well, though some need additional behavior support.
- A rubber dam or isolation system is placed to keep the tooth dry and protect the surrounding tissues during the procedure.
- The decay is removed using a small handpiece. The drill noise can be intimidating for children, so we use language like "tooth tickler" or "spray cleaner" depending on the child.
- The cavity is shaped, etched, and prepared for bonding.
- A bonding agent is applied, then the composite material is placed in layers and cured with a light.
- The filling is shaped to fit the bite and polished smooth.
- The bite is checked and adjusted if needed.
The full procedure for a single filling typically takes thirty to forty-five minutes. Multiple fillings in the same area can often be done in one visit. For very anxious children or complex cases, we offer nitrous oxide or IV sedation. Local anesthetic effects last about two to three hours, so we caution parents about lip-biting and cheek-biting in the first hour after the appointment.
Choosing between filling, crown, and pulpotomy
The size and depth of the cavity drive the choice of restoration. Small to medium cavities that have not reached the tooth's nerve are typically restored with a composite filling. Large cavities that have weakened the tooth substantially may need a stainless steel or zirconia crown to support the remaining tooth structure. Very deep cavities that have reached the nerve may require a pulpotomy before the tooth is restored, or in some cases extraction.
We discuss the options at the visit and explain the reasoning. The choice is rarely arbitrary; it follows the clinical findings.
Filling questions parents ask
Are composite fillings safe for kids?
Yes. Composite resin is BPA-free at our practice (when families request it specifically) and the materials are approved by the FDA and supported by the American Academy of Pediatric Dentistry.
How long do composite fillings last?
Most pediatric composite fillings last several years, often outlasting the primary tooth itself. Permanent tooth fillings can last fifteen years or more depending on size, location, and oral hygiene.
Will my child need anesthesia for a filling?
Yes, typically a local anesthetic injection. For very small cavities or cooperative older children, sometimes a topical-only approach is sufficient. For very anxious children or complex cases, we offer nitrous oxide or IV sedation.
How long does the appointment take?
Thirty to forty-five minutes for a single filling. Multiple fillings in the same area can often be done together.
Will the filling match the tooth color?
Yes. We match the shade to the natural tooth so the filling is barely visible.
My child has a cavity in a baby tooth that will fall out anyway. Why bother filling it?
Untreated cavities in baby teeth can cause pain, infection, abscesses, and damage to the developing permanent tooth underneath. Baby teeth are also placeholders for permanent teeth, and losing them too early can cause crowding and orthodontic complications. We almost always recommend treating cavities in baby teeth.
Can my child eat after a filling?
Wait until the local anesthetic wears off (about two to three hours) to avoid lip or cheek biting. After that, normal eating is fine.
Got a cavity to fix?
Call (916) 638-8778 or book online. Most cavities are caught at six-month checkups before they grow.