Decay in the biting grooves
The pits and fissures of molars hold on to food and plaque. A cavity there can grow before it is felt, and once treatment is needed, the decay is removed and rebuilt.

Your molars do the heavy lifting at every meal. For a back-tooth cavity, people from Acton can find out whether composite suits the size of the repair and the forces of their bite, or whether a sturdier option makes more sense.
Molars grind steak, crack nuts and absorb the pressure of clenching. So when one needs a repair, a sensible first question is whether a tooth-coloured filling can take that kind of work.
For many small and medium cavities, it can. Composite resin is bonded to the prepared tooth in layers and shaped to recreate the chewing surface, giving a restoration close in colour to enamel. The answer changes, though, when the cavity is very wide, the tooth has lost a cusp, or the bite puts unusual strain on it. Then another filling material, an onlay or a crown may serve better.
When you come in from Acton, we look at the tooth, your bite and any signs of grinding before suggesting anything.

Back teeth face their own risks. An exam establishes what caused the damage, how far it extends, and whether there is enough sound tooth for a bonded filling to cope with chewing.
The pits and fissures of molars hold on to food and plaque. A cavity there can grow before it is felt, and once treatment is needed, the decay is removed and rebuilt.
A pointed corner of a molar can break under pressure. A small loss may suit composite; a larger one, or a crack heading toward the root, may need more coverage.
Older fillings on molars face constant load and can wear or chip at the margins. The dentist checks whether it needs repair, replacement or just monitoring.
A molar that aches when you bite may have a crack rather than a cavity. Describe the moment the pain appears and how long it hangs on.
Composite is best known for blending in on front teeth, but it is also used for suitable cavities on premolars and molars. Here the dentist pays particular attention to how big the restoration will be and how much force it will carry.
Placement needs a dry tooth, which can be harder to achieve right at the back of the mouth. A wide repair or a tooth under heavy load may last better with a different restoration. The best choice depends on the tooth in front of us.
Patient information: ADA — tooth-coloured fillings · FDA — filling materials
A shade is chosen to match the molar, so the repair is less obvious when you laugh or yawn.
Bonding may let the dentist preserve more of the healthy tooth, when its condition supports that.
Many direct back-tooth fillings are placed in a single treatment visit, although the exam or other care may be separate.
Knowing the sequence helps the time pass, especially on a day you have set aside to come from Acton. Raise a hand if you need a break, and ask whatever comes to mind.
We talk about your concern and assess the tooth, including how your teeth meet. X-rays may be suggested if they would reveal decay between teeth or around the root. Before treatment, the repair, other options and estimated fee are explained.
Local anaesthetic may numb the area. After damaged tooth is removed, the site is kept clean and dry, which is essential for bonding at the back of the mouth.
Composite is layered in and cured with a light. The dentist shapes cusps and grooves and restores a firm contact with the next tooth so food is less likely to pack in.
Your bite is checked with marking paper and adjusted where needed, then the filling is polished. You can ask about chewing, cleaning, or how the tooth should feel later on.
Use the instructions you were given. If anything feels wrong with the molar, call us rather than waiting for a routine appointment.
Chewing while numb can lead to a bitten cheek or tongue. Take care with hot drinks until normal feeling has returned.
Brief sensitivity to biting or cold can occur. Phone if pain is worsening, sensitivity does not settle, or the filled tooth feels high when you close.
Brush twice a day with a fluoride toothpaste, paying attention to the back teeth, and clean between them daily. Fillings can still develop decay at their margins.
Patient information: Cleveland Clinic — dental fillings
Ask anything about the repair. If you are not sure which tooth it is, tell us where you feel it and when.
Patient information: CDA — tooth-coloured fillings · FDA — existing amalgam fillings
Visit our Bronte Street practice with a back-tooth cavity, a broken cusp or a worn filling. We assess the tooth and your bite first, then explain which repair would suit it.
Please call for significant pain or swelling. Online requests suit non-urgent concerns.