Dental fillings are one of the most common and effective ways to treat a cavity and restore a tooth back to its normal function and shape. When a dentist performs a filling, they first remove the decayed tooth material, clean the affected area, and then fill the cleaned-out cavity with a specialized filling material. By closing off spaces where bacteria can enter, a filling also helps prevent further decay, protecting the long-term health of the tooth.
The most traditional type of filling is made from silver amalgam, which is a mixture of mercury, silver, tin, and copper. Amalgam is incredibly durable and long-lasting, making it a preferred choice for the large molars at the back of the mouth where the chewing pressure is the greatest. While they are visible due to their metallic color, their strength and cost-effectiveness have made them a staple in restorative dentistry for decades.
For those who prefer a more natural look, composite resins are the go-to solution. These fillings are made from a mixture of plastic and glass particles that can be matched precisely to the shade of your existing teeth. Because they bond chemically to the tooth structure, they provide extra support and allow the dentist to preserve more of the natural tooth during the preparation process.
Another premium option is the porcelain or ceramic filling, often referred to as an inlay or onlay. These are custom-produced in a dental laboratory and then bonded to the tooth. Ceramic fillings are highly resistant to staining and are very durable, often lasting over seven years. They offer a high level of aesthetic appeal, making them virtually indistinguishable from natural tooth enamel.
Glass ionomer fillings are often used for fillings below the gum line or for young children whose teeth are still changing. These are made of acrylic and a specific type of glass material. One unique benefit of glass ionomers is that they can release fluoride over time, which helps strengthen the surrounding tooth structure and provides an extra layer of protection against future cavities.
The process of getting a filling usually begins with a local anesthetic to numb the area around the tooth. Once the patient is comfortable, the dentist uses a drill, air abrasion instrument, or laser to remove the decayed area. The choice of tool depends on the dentist’s investment in technology and the specific location and extent of the decay within the mouth.
After the decay has been removed, the dentist will probe or test the area to determine if all the bacteria have been cleared. Once the cavity is clean, the space is prepared for the filling by cleaning it of debris and etching the surface if a composite material is being used. This ensures that the filling material adheres perfectly to the tooth and creates a tight seal.
If the decay is near the tooth root, your dentist may first put in a liner made of glass ionomer, composite resin, or another material to protect the nerve. After the filling is placed, it is typically cured or hardened using a special “blue light.” Once the material has hardened, the dentist will trim any excess material and polish the final restoration so it feels smooth to your tongue.
Following the procedure, it is normal to experience some temporary sensitivity to hot or cold temperatures. This usually subsides within a few days as the tooth heals and adjusts to the new material. If the sensitivity persists or if your “bite” feels off—meaning your teeth don’t fit together comfortably when you close your mouth—a quick follow-up visit for a minor adjustment is usually all that is needed.
Maintaining your fillings requires the same level of care as your natural teeth. Regular brushing, flossing, and professional dental cleanings are essential to prevent new decay from forming around the edges of the filling. With proper oral hygiene, a high-quality dental filling can last for many years, allowing you to eat, speak, and smile with complete confidence and comfort.