Restorative Fillings 101: Materials, Procedure, and Aftercare – composite fillings, when they're n
Author : Top Class Dental | Published On : 05 Aug 2026
A restorative filling repairs a tooth damaged by decay, chips, or fractures by filling the affected area with a durable material. Fillings restore 3 things at once: tooth structure, chewing function, and protection against further decay.
There are 4 things every patient should understand: filling materials, when a filling is needed, what the procedure involves, and how to care for a filling afterward.
What Are Restorative Fillings Made Of?
Restorative fillings use composite resin, ceramic, or amalgam, depending on the location and size of the damage. Composite resin is the most common choice, since it bonds directly to the tooth and matches natural tooth colour.
Four filling materials serve different needs:
- Composite resin: Tooth-coloured, ideal for front and back teeth, bonds chemically to enamel
- Ceramic (porcelain): Highly stain-resistant, used for larger restorations or inlays
- Amalgam: A durable silver-coloured alloy, still used in some back-tooth restorations
- Glass ionomer: Releases fluoride over time, often used for children or root-surface fillings
At Top Class Dental, Restorative Fillings are placed using composite resin as the primary material, chosen for its strength and natural appearance.
When Is a Filling Needed?
A filling is needed when decay, a chip, or a fracture compromises the tooth's structure but the tooth remains restorable without a crown. Five signs point to the need for a filling:
- Visible dark spots or holes on the tooth surface
- Sensitivity to hot, cold, or sweet foods
- Pain when biting down on a specific tooth
- A rough or jagged edge felt with the tongue
- Food consistently trapping in the same spot between teeth
Regular check-up and clean visits catch decay early, often before any of these symptoms develop.
How Does the Filling Procedure Work?
The filling procedure takes 20 to 40 minutes per tooth and happens in 4 steps. First, the dentist numbs the area with local anaesthetic. Second, decayed or damaged tissue is removed. Third, the composite resin is applied in layers and hardened with a curing light. Fourth, the filling is shaped and polished to match the natural bite.
What Happens if Decay Is Left Untreated Instead of Filled?
Untreated decay spreads deeper into the tooth, eventually reaching the nerve. At that stage, a simple filling is no longer sufficient, and treatment escalates to Root Canal Treatment or extraction.
How Long Do Composite Fillings Last?
Composite fillings last 7 to 10 years on average, though lifespan depends on the filling's location, bite force, and oral hygiene habits. Fillings on chewing surfaces of back teeth wear faster than those on front teeth, due to greater bite pressure.
What Should Patients Expect During Filling Recovery?
Recovery from a filling is immediate for most patients, with mild sensitivity lasting 24 to 48 hours after the anaesthetic wears off. Composite fillings harden instantly under the curing light, so patients can eat as soon as numbness subsides, typically within 2 to 3 hours.
Four aftercare steps support a long-lasting filling:
- Avoid chewing on the treated side until numbness fully wears off, to prevent accidental bite injury
- Use a soft-bristled toothbrush for 1 to 2 days if the gum area feels tender
- Limit very hot or cold foods for 24 to 48 hours, if sensitivity occurs
- Continue twice-daily brushing and daily flossing to protect the filling margin from new decay
Can a Filling Fall Out or Fail?
Yes, a filling can fail if decay develops underneath it, or if the bonding weakens from repeated bite stress over time. Signs of a failing filling include a visible gap, a rough edge, or renewed sensitivity in the same tooth, all of which warrant a prompt dental check.
Frequently Asked Questions
Are composite fillings safe?
Composite fillings are safe and do not contain mercury, unlike amalgam fillings, making them a common choice for both adults and children.
Does getting a filling hurt?
The filling procedure itself is painless, since local anaesthetic numbs the area before any decay is removed.
Can old amalgam fillings be replaced with composite?
Yes, old amalgam fillings can be replaced with composite resin for cosmetic reasons or if the amalgam filling shows signs of wear or leakage.
How soon can I eat after a filling?
Most patients can eat once numbness fully wears off, typically within 2 to 3 hours, since composite fillings harden immediately under the curing light.
Protect Your Smile With Timely Filling Care
Small cavities are far easier and more affordable to treat than the complications that follow neglect. Top Class Dental in Burwood uses tooth-coloured composite fillings to restore damaged teeth quickly and comfortably.
Book an appointment or call (02) 9744 0222 if you notice sensitivity, pain, or visible decay.
