A cavity does not go away on its own once a hole has formed in the tooth. At that point, the damaged area generally needs to be removed and repaired with a dental filling to keep the decay from progressing.
At Parthenon Dental, we provide dental fillings in San Ramon using tooth-colored composite resin that can be matched to the surrounding tooth. Fillings are typically completed in one visit, depending on the extent and location of the decay.
If you know you have a cavity or are concerned about a tooth, schedule a visit with our San Ramon team. We can examine the area, determine how much of the tooth is affected, and explain whether a filling is the appropriate treatment.
Below, we cover what happens during a dental filling, how we choose the material, and what you can do to help maintain the restoration afterward.
Why a Cavity Should Not Wait

Tooth decay can progress when it is left untreated. Once decay has caused a cavity in the enamel, the tooth cannot repair that damaged area on its own. As the decay extends deeper into the tooth, treatment can become more involved.
A smaller cavity may be treated with a dental filling, while more extensive damage may require a crown. If decay reaches and damages or infects the pulp inside the tooth, root canal treatment may be necessary. In some cases, a tooth that is too severely damaged to restore may need to be removed.
Pain is not a reliable way to judge how far a cavity has progressed. Early tooth decay often causes no symptoms, which is one reason we look for signs of decay during routine dental exams rather than waiting for a tooth to hurt.
Treating a cavity while there is still enough healthy tooth structure to support a filling can help preserve more of the natural tooth and reduce the chance that more extensive restorative treatment will be needed.
What Happens During a Dental Filling Visit

A dental filling appointment at our San Ramon office is typically completed in one visit. The exact amount of time depends on the size and location of the cavity and how many teeth need treatment.
The process generally follows a consistent sequence:
- We numb the area around the affected tooth to keep you comfortable during treatment.
- We remove the decayed tooth structure and prepare the area for the filling.
- We place the composite filling material, building it up to restore the natural shape of the tooth.
- The composite is hardened with a special curing light.
- We shape and polish the finished filling and check how it fits with your bite.
That last step is important. Even a small difference in the height or shape of a restoration can affect how your teeth come together. Before you leave, we check your bite and make adjustments when needed so the filling fits properly with the surrounding teeth.
Composite Dental Fillings vs. Other Materials
Composite resin is a tooth-colored filling material that bonds to the tooth and can be closely matched to the surrounding enamel. It can be used in both front and back teeth, depending on the size and location of the restoration.
Amalgam, sometimes called a silver filling, is another established restorative material. It is durable and can still be appropriate in certain situations, particularly in areas exposed to heavier chewing forces. At Parthenon Dental, we primarily use composite fillings because they allow us to restore the tooth with a material that blends naturally with your smile.
The material we recommend depends on a few specifics:
- Where the cavity is located and how much of the tooth is affected.
- The amount of chewing force the restoration will need to handle.
- The condition of the remaining tooth structure.
- Whether the filling will be visible when you smile or talk.
We will explain the recommended filling material and why it makes sense for your tooth before treatment begins.

How Long Does a Composite Dental Filling Last?
Composite fillings often last five to ten years, and some remain in good condition longer. How long yours lasts depends on factors such as the size and location of the filling, your bite, your oral hygiene, and the amount of force placed on that tooth.
A few habits can help protect your fillings:
- Avoid chewing ice or biting other very hard objects that can chip or fracture a tooth or restoration.
- Keep up with regular cleanings and exams so we can monitor the filling and check for decay around its edges.
- Let us know if a filled tooth becomes painful, unusually sensitive, or feels different when you bite so we can determine what is causing the change.
Grinding and clenching can also place additional force on your teeth and restorations. If we see signs of wear consistent with grinding, we may discuss whether a night guard could help protect your teeth and existing dental work.
When a Cavity Needs More Than a Filling

Not every cavity can be treated with a straightforward filling. If decay or damage has affected a significant portion of the tooth, there may not be enough healthy tooth structure remaining to support a filling reliably. In those cases, a crown may provide the coverage and support the tooth needs.
If decay reaches the pulp inside the tooth and causes inflammation or infection that cannot heal on its own, root canal therapy may be needed before the tooth is restored.
This is one reason treating decay earlier can make a difference. When a cavity is smaller and enough healthy tooth structure remains, a filling may be all that is needed. As decay becomes more extensive, the treatment required to restore the tooth can become more involved.
Take Care of a Cavity Before It Needs More Treatment
If you know you have a cavity, or you are noticing sensitivity, discomfort, or another change in a tooth, it is worth having it evaluated. Tooth decay can progress without causing obvious symptoms, and treating it while enough healthy tooth structure remains may allow for a simpler restoration.
At Parthenon Dental, we focus on removing the damaged tooth structure, restoring the tooth with a natural-looking composite filling, and checking the finished restoration against your bite. We will explain what we find and why we are recommending a filling or, when necessary, another type of restorative treatment.
Our office is on San Ramon Valley Boulevard near City Center Bishop Ranch and I-680. We serve patients throughout San Ramon, including Dougherty Valley, Gale Ranch, and Windemere, as well as surrounding communities such as Danville, Alamo, and Dublin.
Schedule an appointment with Parthenon Dental to have the tooth evaluated. If a filling is appropriate, we can restore the damaged area and help protect the remaining healthy tooth structure.
Dental Fillings FAQs
How do I know if I need a dental filling?
You may need a filling if you have a cavity or a damaged area of a tooth that can still be restored with filling material. Cavities do not always cause pain, so a dental exam and, when appropriate, X-rays may be needed to determine whether a filling is necessary.
Can a cavity heal without a filling?
Very early tooth decay may sometimes be stopped or reversed before a cavity forms. Once decay has created a physical hole in the tooth, however, the damaged area generally needs to be restored rather than healing on its own.
Can I eat after getting a composite filling?
Composite fillings harden during the appointment, but your mouth may remain numb afterward. Follow your dentist’s instructions and be careful eating or chewing until normal sensation returns so you do not accidentally bite your cheek, lip, or tongue.
Is sensitivity normal after a dental filling?
Some temporary sensitivity can occur after a filling. If sensitivity is severe, continues longer than expected, or the tooth hurts when you bite, contact your dentist so the filling and tooth can be evaluated.
Will a tooth-colored filling match my tooth?
Composite resin is available in different shades and can be selected to closely match the surrounding tooth. This makes composite fillings much less noticeable than traditional silver-colored amalgam restorations.