What is a filling, and when is it needed?
With a filling, decayed or damaged tooth tissue is removed and the cavity is sealed with a filling material. According to Cleveland Clinic, this usually goes as follows: the tooth is numbed with local anaesthetic, the diseased tissue is removed, the hole is filled, and tooth-coloured composite is hardened with a curing light; finally the bite is checked.
A filling comes into question mainly in these cases:
- Decay has formed a cavity: the NHS writes that a cavity usually needs a filling.
- Small chips and cracks: Cleveland Clinic also lists the repair of minor chips; more in our guide chipped or cracked tooth.
In the early stage, no filling is needed yet. According to the NHS, early decay often causes no symptoms and can be reversed with fluoride treatments such as varnish or mouthwash, combined with good home care.
How does treatment change the deeper the decay goes?
From the outside in, a tooth consists of enamel, dentine and the pulp at the centre, the living tissue of nerves and blood vessels. The deeper the decay reaches, the more extensive the treatment. The table summarises the information from the NHS and Cleveland Clinic; which stage your tooth is at is shown by the examination.
| Finding | Usual treatment |
|---|---|
| Early decay without a cavity | fluoride and adjusted home care |
| Decay with a cavity | filling |
| Too much tooth lost for a filling | inlay, onlay, partial crown or crown |
| Decay reaching the pulp, irreversible pulp inflammation | root canal treatment |
| Tooth that cannot be saved | extraction |
According to Cleveland Clinic, a filling no longer solves the problem once decay has reached the pulp; root canal treatment is then needed. Left untreated, pulp inflammation worsens and ends in root canal treatment or extraction. Decay that could be treated with a filling today can therefore lead to root canal treatment or tooth loss if postponed.
Does the type of pain show whether a filling or root canal is needed?
Symptoms give clues but are not enough on their own. Cleveland Clinic distinguishes two stages of pulp inflammation:
- Reversible pulpitis: brief, sharp sensitivity to cold or sweets that fades quickly after the trigger; no pain on tapping, no sensitivity to heat. If the decay is removed and the tooth filled, the inflammation resolves.
- Irreversible pulpitis: sensitivity to heat, cold or sweets lingers well beyond a few seconds, and the tooth hurts when tapped. The pulp can no longer recover; it has to be removed, meaning root canal treatment or extraction.
The absence of pain is not an all-clear. According to the NHS, decay often causes no symptoms at first. According to Cleveland Clinic, a dead pulp often no longer reacts to stimuli, but the tooth hurts when tapped. The American Association of Endodontists (AAE) points out that trauma can damage the pulp even without a visible chip or crack.
How does the dentist decide between filling and root canal?
To judge the condition of the pulp, your history is taken and tests are carried out. According to the AAE position statement on vital pulp therapy (2021) and Cleveland Clinic, these include:
- Pain history: onset, triggers and duration of the symptoms.
- Cold and heat test: how long the tooth reacts to the stimulus; according to Cleveland Clinic, more than a few seconds with irreversible pulpitis.
- Electric pulp test: according to the AAE, part of the assessment alongside the cold test.
- Tapping test: according to the AAE, pain on percussion indicates irreversible inflammation.
- X-ray: shows defects and signs of infection.
The AAE notes that no test yet reliably measures the vitality of the pulp; looking directly at the pulp while the decay is removed contributes to the assessment. With deep decay, the final plan may therefore emerge only during treatment.
Is there anything between a filling and root canal treatment?
In some cases, yes. The AAE groups under “vital pulp therapy” procedures that aim to keep a pulp damaged by trauma, decay or treatment alive and functional:
- Pulp capping (indirect or direct): areas close to the pulp, or a small exposed spot, are covered with a protective material.
- Partial or full pulpotomy: according to Cleveland Clinic, the diseased part of the pulp in the crown of the tooth is removed and the root portion stays; the procedure is most common in baby teeth but is also an option for adults.
According to the AAE, a diagnosis of irreversible pulpitis does not always mean that the entire pulp must be removed; how much is kept is decided by the dentist from the condition of the tissue. The immediate permanent restoration of the tooth must be part of the plan, and the AAE points to the need for further long-term studies. Whether such a procedure is possible for you is assessed at the examination.
Which filling materials are there?
According to Cleveland Clinic, there are fillings placed directly in the mouth and pieces made in a laboratory and bonded in:
- Composite: tooth-coloured resin with glass or quartz filler. According to MouthHealthy, the patient portal of the American Dental Association, it is durable and resistant to fracture in small to mid-size fillings and suits front and back teeth.
- Glass ionomer: tooth-coloured material based on silicate glass.
- Porcelain and gold: inlays and onlays made in the laboratory. According to Cleveland Clinic, they are used when the tooth is too damaged for a filling but not damaged enough to need a crown.
When a crown becomes necessary is explained on our zirconia crowns page.
Can a filled tooth need root canal treatment later?
Yes. The AAE counts among the causes of pulp inflammation not only deep decay but also repeated procedures on the same tooth, faulty crowns, and cracks and chips. Teeth with deep or repeatedly replaced fillings can therefore be affected over time.
Sensitivity after a filling, on the other hand, is usually temporary; according to Cleveland Clinic, it generally fades within one to two weeks. Have the tooth examined if:
- the sensitivity lasts longer than two weeks or increases
- the pain lingers for a long time after hot or cold food
- severe pain, facial swelling, fever or chills develop
- the filling breaks or falls out
With swelling of the face, around the eye or in the neck, or difficulty swallowing or breathing, go to an emergency department.
What does this mean for treatment in Türkiye?
Fillings can be done within one stay, often on the same day as the examination. With root canal treatment, the number of sessions depends on the case: the NHS writes that treatment usually takes two or more appointments, sometimes with a temporary filling in between, and MouthHealthy explains that the temporary filling is replaced with a permanent filling or a crown at a follow-up visit. Plan enough days so that after the root filling the final filling or crown can also be placed on site; why this matters is explained in our guide crown after root canal treatment.
On the flight home: an article in the British Dental Journal (Felkai and colleagues, 2023) gives a minimum of 24 hours after a filling and 72 hours after root canal treatment, provided there is no pain, swelling or bleeding; the authors recommend rather a week after most procedures. Discuss when you can fly with your dentist on site.
At our clinic in Serdivan, your symptoms and history are recorded, the tooth and the surrounding tissue are examined and X-rays are taken if needed; if the extent of inflammation at the root tip or a crack needs to be clarified, a cone-beam CT (CBCT) scanner is available. Before treatment starts, you receive a written treatment and cost plan; when you leave, a treatment summary and copies of your X-rays. For a preliminary assessment, send photos and existing X-rays on WhatsApp at +90 532 363 49 54; we communicate in English and German. The procedure is described on our root canal treatment page; what you feel during and after treatment, in does root canal treatment hurt; how long a treated tooth lasts, in how long does a root canal treated tooth last.