Tooth decay and small areas of damage can often be treated effectively with a filling, helping to restore comfort, function and the tooth’s natural shape. A filling is a common form of restorative dentistry and, when placed early, can prevent a cavity from spreading deeper into the tooth where more complex treatment may be needed.

What this treatment is designed to do

A filling repairs a tooth that has been affected by decay, or has a minor chip or crack. The damaged area is removed and replaced with a durable restorative material, sealing the tooth and reducing the risk of bacteria re-entering the area.

Depending on the material used and the size and location of the cavity, a filling can also:

• Restore normal biting and chewing
• Reduce sensitivity caused by exposed or weakened tooth structure
• Improve appearance when tooth-coloured materials are appropriate
• Preserve more of the natural tooth than larger restorations such as crowns

When a filling is likely to be suitable

Fillings are typically recommended when:

• A cavity is present but has not reached the tooth’s pulp (the nerve and blood supply)
• There is a small fracture, chip, or worn area that needs reinforcement
• An old filling has broken down, leaked, or fallen out and the tooth can be restored conservatively

A filling may not be the right option if a tooth is too weakened or the decay is extensive. In those situations, other treatments may be advised, such as an inlay/onlay, a crown, or root canal treatment.

Assessment and planning before treatment

At your appointment, a dentist will assess the tooth and surrounding gums and discuss your symptoms, such as sensitivity or pain when biting. Planning commonly includes:

• A clinical examination of the tooth and bite
• Dental X-rays where needed to check the depth of decay and look for problems between teeth
• A discussion about the most suitable restorative material for your tooth and lifestyle

Material choice is individual. Tooth-coloured composite is often used for visible areas, while other materials may be considered depending on the tooth, bite forces, moisture control, and the size of the restoration.

If you feel anxious about dental treatment, sedation options may be discussed to help you stay calm and comfortable.

Types of fillings and materials

Fillings generally fall into two categories.

Direct fillings (completed in one visit)

These are placed and shaped in the mouth during a single appointment. Common direct materials include:

• Resin composite (tooth-coloured): widely used, especially for front teeth and many back teeth
• Glass ionomer (tooth-coloured): sometimes used for certain areas, including where fluoride release may be beneficial
• Amalgam (silver-coloured): durable and long used in back teeth, though less commonly chosen for cosmetic reasons and because alternatives are available

Indirect fillings (inlays and onlays)

When a tooth has too much damage for a standard filling but does not require a full crown, an inlay or onlay may be recommended. These are made to fit precisely and are typically produced in a laboratory or using CAD/CAM technology.

Common indirect materials include:

• Porcelain (tooth-coloured)
• Gold alloy

The best option depends on the tooth, the size of the defect, aesthetic preferences, and how you bite.

What happens during the appointment

Exact steps vary depending on the material and the tooth being treated, but the process typically includes:

1. Numbing the tooth: local anaesthetic is used so the area is comfortable.
2. Removing decay or damaged tooth structure: the affected area is cleaned using dental instruments.
3. Placing the restorative material: the filling is inserted in layers or as a single placement depending on the material.
4. Hardening (for composite fillings): a curing light is used to set the material.
5. Shaping and polishing: the restoration is refined to feel smooth and natural.
6. Checking the bite: the bite is assessed and adjusted so the tooth closes comfortably.

You should be able to raise concerns during the procedure. If anything feels sharp, high, or uncomfortable, it is usually straightforward to adjust.

Aftercare, recovery and what to expect

Most people return to normal activities immediately after a filling, unless sedation has been used.

Sensitivity and soreness

It is common to have mild sensitivity to cold, sweet foods, or pressure for a short period. Gum tenderness around the treated tooth can also occur. These symptoms typically improve over 1 to 2 weeks.

Over-the-counter pain relief such as acetaminophen or ibuprofen may help if needed, provided it is safe for you to take.

Eating and drinking

Eating is generally safe after the procedure, but it is sensible to wait until numbness wears off to avoid accidentally biting your cheek or tongue. If you eat sooner, chewing slowly and carefully can help.

Follow-up

A routine review is not always required after a straightforward filling, but you should let the dental team know if the bite feels uneven, the tooth remains very sensitive, or discomfort persists.

Risks, limitations and important considerations

Fillings are a reliable, well-established treatment, but no restoration lasts forever. Important considerations include:

• Temporary sensitivity: common and usually settles.
• High bite or pain when chewing: sometimes a filling sits slightly proud and needs minor reshaping.
• Persistent toothache or lingering hot/cold pain: may indicate deeper inflammation or nerve involvement, and further treatment such as root canal therapy may be needed.
• Chipping or wear over time: especially with heavy bite forces, teeth grinding, or very large fillings.
• Recurrent decay: can occur around a filling if plaque builds up at the margins.

Amalgam safety

Many public health bodies state that dental amalgam fillings are safe for most people. However, some individuals may be advised to avoid amalgam where possible, including:

• Pregnant people and those planning pregnancy within a year
• Breastfeeding people and newborns
• Children, especially under 6
• People with certain neurological conditions
• People with impaired kidney function
• People with known allergies or sensitivities to amalgam components

If an existing amalgam filling is in good condition, removal is not routinely recommended solely to reduce mercury exposure, as removal can increase exposure temporarily and may remove additional tooth structure.

When to contact the dental team urgently

Seek prompt advice if you experience:

• Severe pain that does not settle with recommended pain relief
• Swelling of the face or jaw
• Fever, chills, or feeling unwell
• A filling that breaks, falls out, or feels sharp

These symptoms can indicate infection, a cracked tooth, or a restoration problem that needs timely care.

How care is coordinated at our clinic

Care is provided through a single dedicated dental clinic, with continuity from initial assessment through treatment and aftercare. Your appointment includes time to discuss options, expected outcomes, and any concerns about comfort or anxiety.

If a filling is not the best solution, the next appropriate step is explained clearly, including alternatives such as inlays/onlays, crowns, or root canal treatment. Our medical team aims to keep treatment conservative where possible, while making sure the tooth is properly protected for the long term.

Regular check-ups and professional cleaning remain important after a filling. They help identify early decay, monitor existing restorations, and reduce the chance of needing more complex treatment later.