Dental Fillings: Types and When One Is Needed

A dental filling is a treatment in which the cavity left in the tooth after decayed tissue has been removed is filled with a special material, restoring the tooth's shape, function and strength. A filling is usually recommended when tooth decay (caries) is detected at an early or moderate stage — the aim is to stop the decay and preserve as much of the natural tooth as possible.

The choice of filling material is determined during tooth decay treatment according to the position of the tooth, the size of the cavity and aesthetic requirements.

Important note: Only a dentist can determine whether your tooth needs a filling and which material is most suitable, based on an examination and, where necessary, an X-ray. The information below is for general purposes.

When is a dental filling needed?

A filling is mainly used when part of a tooth is damaged but the tooth can still be saved. Typical cases:

1. Tooth decay (caries) — the most common reason; the decayed tissue is removed and the cavity is filled.
2. Small cracks or chips — when a small part of the tooth breaks off, its shape can be restored with a filling.
3. Worn teeth — areas that have lost their shape through brushing damage or erosion.
4. Replacing an old filling — a filling that has worn down over the years or developed a gap at its edge is renewed.

The key principle is this: a filling does not replace a lost tooth, it restores the damaged part of an existing tooth. When decay involves a large part of the tooth, a filling may no longer be enough — in that case a dental crown or another treatment may be required.

The main types of dental filling

Fillings differ according to the material they are made from. Each has its own advantages:

• Composite (white/tooth-coloured) filling — the most popular choice aesthetically, as it matches the natural tooth shade; ideal for front and visible teeth. It is bonded directly to the tooth.
• Glass ionomer — because it can release fluoride, it may be used in certain cases, particularly on root surfaces and in children's teeth; suitable for areas under low load.
• Amalgam (metal/silver) filling — very strong and used for many years; mainly placed in back teeth that are not visible, although its colour differs from the natural tooth.
• Ceramic (inlay/onlay) — made in a laboratory, a durable and aesthetic option for larger restorations.

Which material is suitable depends on the position of the tooth (front/back), the size of the cavity, the biting load, aesthetic expectations and budget. Making the choice together with your dentist is the best approach.

How is a filling placed?

The process is usually completed in a single visit: the tooth is numbed if needed, the decayed tissue is removed, the cavity is prepared, and the material is placed and set; finally the filling is adjusted to the bite and polished. Composite fillings are cured layer by layer with a special light. The procedure is often short, but the time depends on the size of the cavity.

How long does a filling last?

With proper care a filling can serve for many years, but the exact lifespan depends on the material, the size of the filling, the biting load and oral hygiene. If plaque builds up at the edge of the filling, especially at the gum line, the remaining part of the tooth can decay again. That is why daily brushing, flossing and regular check-ups are important. No restoration comes with a "lifetime guarantee" — care is the single most important factor in extending its life.

What to watch for after a filling

• mild sensitivity to hot and cold in the first few days is normal and usually passes quickly;
• being careful when chewing until the numbness wears off prevents biting the tongue and cheek;
• if the filling feels "high" when you bite (your teeth do not meet properly), tell your dentist — the adjustment is easy;
• if you feel persistent pain around the filling, or notice a crack or the filling coming out, contact your dentist.

Questions and Answers (FAQ)

Is having a filling painful? The procedure is usually carried out under local anaesthetic, so no pain is expected during treatment. For very small, superficial cavities it is sometimes possible without numbing. Mild sensitivity may occur in the following days and passes quickly.

Which is better, a white (composite) filling or a silver (amalgam) filling? Both have their place. White composite gives a natural appearance and is preferable for front and visible teeth; amalgam stands out for its strength in back teeth exposed to heavy loads. Your dentist makes the appropriate choice according to the position and condition of the tooth.

What should I do if a filling falls out? A filling coming out or cracking is not unusual. If this happens, avoid foods that irritate the tooth, keep the area clean and see your dentist as soon as possible — an exposed tooth can decay again or become sensitive.

Can a filled tooth decay again? Yes. Although a filling restores part of the tooth, if plaque builds up at its edge the remaining tooth tissue can decay again. That is why daily hygiene and regular check-ups are important.

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Clinical note: This article is for general information and does not replace individual advice from your dentist. To find out whether your tooth needs a filling, book an appointment.

Sources: Peer-reviewed restorative dentistry literature. The clinical content is based on Dr. Nuran's dental practice.