Dental Fillings

What Is a Dental Filling?

A dental filling is a restorative treatment used to repair a tooth that has been damaged by decay (a cavity). When bacteria in the mouth produce acids that erode tooth enamel, a cavity forms. If left untreated, the decay spreads deeper into the tooth, eventually reaching the pulp and causing pain, infection, or tooth loss. A filling stops decay in its tracks and restores the tooth to its normal shape and function.

At Gentle Family Dentistry in Hampton, NH, we use tooth-colored composite resin fillings — not old-fashioned silver amalgam. Composites look natural, bond directly to the tooth structure, and require the removal of less healthy tooth material.

Types of Filling Materials

The ADA recognizes several filling materials, each with different advantages:

• Composite Resin (Tooth-Colored): A mixture of glass or quartz filler in a resin base. Bonds directly to the tooth. Excellent aesthetics. Our standard choice for most fillings.
• Dental Amalgam (Silver): A blend of mercury, silver, tin, and copper. Very durable and affordable, though less aesthetically pleasing. Used in some situations where composite isn't ideal.
• Gold / Porcelain (Inlays/Onlays): Indirect restorations fabricated in a lab for larger cavities. Extremely durable and long-lasting. See our Inlays & Onlays page.

Source: American Dental Association — Dental Filling Options (MouthHealthy.org)

The Filling Procedure

Getting a filling is straightforward and comfortable. Dr. Li begins by numbing the area with local anesthetic — most patients feel nothing more than a slight pinch. She then removes the decayed tissue, thoroughly cleans the cavity, and places the composite resin in layers. A special blue light is used to harden each layer. Finally, the filling is shaped and polished to match your natural bite.

The entire appointment typically takes 30–60 minutes depending on the size and location of the cavity. You'll be able to eat and drink normally shortly after the anesthetic wears off.

How to Prevent Cavities

The best filling is no filling at all. The ADA recommends: brushing twice daily with fluoride toothpaste, flossing once daily, limiting sugary and acidic foods and drinks, and visiting your dentist every six months for professional cleanings and checkups. Sealants and fluoride treatments provide additional protection — ask about these at your next visit.

When Should I Replace an Old Filling?

Fillings are not permanent and will eventually wear down, chip, or crack. Dr. Li monitors your existing restorations at every checkup. Signs that a filling may need replacement include sensitivity to temperature, visible cracks, or food getting caught. Old metal amalgam fillings can also be replaced with modern tooth-colored composites for a more natural appearance.