Cavities: Causes, Symptoms and Treatment Options
Cavities are areas of permanent damage that develop in tooth enamel when bacteria in plaque produce acids that weaken tooth structure. They may begin as small areas of enamel damage and gradually deepen over time if left untreated.
Early cavities may not produce noticeable symptoms. Professional dental assessment helps identify cavities and determine the most appropriate treatment approach.
Professional Assessment
A thorough clinical evaluation can detect cavities — including those not yet visible — and guide the most appropriate restorative or preventive care plan.
“A thorough check-up found a cavity I had no idea about. Very glad I came in.”
What Are Cavities?
Cavities are small holes or areas of structural damage within a tooth. They form when enamel — the hard, protective outer layer of the tooth — is weakened by acid produced by bacteria in dental plaque. Over time, the damage may progress from the enamel surface into deeper layers of the tooth, including the dentine and potentially the pulp.
Enamel Damage
Cavities begin when acids produced by plaque bacteria dissolve minerals in the tooth enamel. This process, known as demineralisation, creates weak spots that may eventually develop into visible holes in the tooth surface.
Progressive Condition
Without treatment, cavities may continue to enlarge, spreading from the enamel into the softer dentine beneath. In advanced cases, the decay may reach the tooth pulp, potentially causing infection and significant discomfort.
Extremely Common
Cavities are one of the most common dental conditions, affecting both children and adults. They can develop on any tooth surface and are frequently identified during routine dental examinations.
Early detection through regular allows cavities to be identified before they cause symptoms, potentially enabling less invasive treatment.
Common Causes of Cavities
Cavities usually develop from a combination of factors rather than a single cause. Understanding these contributing factors can support more effective prevention and earlier professional intervention.
1Sugary and Acidic Foods
Frequent consumption of sugary or acidic foods and drinks provides fuel for the bacteria in dental plaque. These bacteria metabolise sugars and produce acids that attack tooth enamel, increasing the risk of cavity formation — particularly with frequent snacking throughout the day.
2Plaque Build-Up
Plaque is a sticky film of bacteria that forms continuously on tooth surfaces. When not removed through regular brushing and interdental cleaning, plaque accumulates and the bacteria within it produce sustained acid exposure that weakens the enamel over time.
3Reduced Saliva Flow
Saliva plays a protective role by helping to wash away food particles, neutralise bacterial acids, and deliver minerals that support enamel repair. Conditions or medications that reduce saliva flow may increase the risk of cavities developing.
4Deep Tooth Grooves
The chewing surfaces of back teeth (molars and premolars) often contain deep grooves and pits that can trap food particles and bacteria. These areas can be particularly difficult to clean effectively with a toothbrush, making them common sites for cavity development.
5Irregular Dental Examinations
Without regular professional dental assessments, early cavities may go undetected until they become larger and produce symptoms. Routine examinations — which may include X-rays — allow early identification and timely intervention.
In most cases, cavities result from a combination of these factors acting together over time. Your dentist can help identify which factors may be most relevant to your situation.
Symptoms of Cavities
Cavities do not always cause symptoms in their early stages, which is why regular dental examinations are important. As a cavity progresses, however, a number of symptoms may become noticeable.
Sensitivity to Hot, Cold, or Sweet Foods
As decay penetrates through the enamel, the underlying dentine may become exposed. This can cause a sharp or lingering sensitivity when consuming hot, cold, or sweet foods and drinks.
Visible Dark Spots or Holes
A cavity may appear as a dark spot, discolouration, or visible hole on the tooth surface. These are sometimes visible when looking in a mirror, though many cavities develop in areas that are difficult to see without professional examination.
Pain When Chewing or Biting
Discomfort or pain when biting down on food may indicate that a cavity has weakened the tooth structure. The pressure of chewing can aggravate the damaged area, particularly if the cavity is large.
Occasional Toothache
A toothache — which may be mild, intermittent, or persistent — can be a sign that a cavity has progressed into deeper layers of the tooth. Pain may occur spontaneously or in response to certain foods.
Food Trapping
If food frequently becomes trapped in the same area of the mouth, this may indicate a cavity or damage to the tooth surface that is creating a space where debris accumulates.
When to Seek Assessment
Many cavities develop without noticeable symptoms. If you experience any of the following, professional dental assessment may be appropriate to determine whether treatment is needed.
Tooth sensitivity becomes persistent or worsening
Visible holes or dark spots appear on teeth
Pain develops when chewing or biting
Food becomes repeatedly trapped between teeth
Discomfort worsens over time
These symptoms do not necessarily confirm a cavity but warrant professional evaluation to determine the cause and guide appropriate care.
When Dental Assessment May Be Recommended
Because cavities can develop without obvious symptoms, regular dental examinations are the most effective way to detect them early. However, certain signs may suggest that an earlier assessment would be advisable.
Consider Professional Assessment If:
Tooth sensitivity becomes persistent, particularly to hot, cold, or sweet stimuli.
Visible holes, pits, or dark discolouration appear on any tooth surface.
Pain develops when chewing or biting down on food.
Food becomes repeatedly trapped in the same area.
Discomfort in a tooth worsens over time or becomes spontaneous.
It has been more than six months since your last dental examination.
What Assessment Involves
A dental assessment for suspected cavities typically includes a visual examination of the teeth, exploration with dental instruments, and may involve dental X-rays to detect cavities that are not visible to the eye — such as those between teeth or beneath existing restorations.
Based on the findings, your dentist can explain the extent of any decay and discuss the most appropriate treatment options for your individual situation.
Treatment Options for Cavities
Treatment depends on clinical examination and the extent of the cavity. The aim of treatment is to remove decayed tooth material and restore the tooth’s structure, function, and appearance where possible.
Assessment and treatment options for cavities are available at our London clinic, where professional evaluation can determine the most appropriate course of care.
Restorative Approaches
For small to moderate cavities, a filling may restore the damaged area of the tooth. The decayed material is removed and the cavity is filled with a restorative material — such as tooth-coloured composite resin — to rebuild the tooth surface and protect it from further decay.
For larger cavities that have significantly weakened the tooth structure, a dental crown aims to protect the remaining tooth. The crown covers the entire visible portion of the tooth, providing strength and restoring its shape and function.
If decay has progressed to the tooth pulp — the inner tissue containing nerves and blood vessels — root canal treatment may be recommended. This aims to remove the infected pulp, clean the root canals, and seal the tooth to preserve it.
In cases where the tooth cannot be restored — due to extensive decay or structural compromise — extraction may be the most appropriate option. Your dentist can then discuss tooth replacement options if needed.
Preventing Cavities
While cavities are common, many can be prevented or detected early through good oral hygiene habits and regular professional dental care. The following measures may help reduce the risk of cavity formation.
Brush Twice Daily
Use fluoride toothpaste and brush for at least two minutes, twice a day. Pay particular attention to all tooth surfaces, including the chewing surfaces of back teeth and along the gumline where plaque tends to accumulate.
Clean Between Teeth
Use dental floss or interdental brushes daily to remove plaque and food debris from between teeth — areas that a toothbrush cannot reach effectively and where cavities commonly develop.
Limit Sugary Foods
Reducing the frequency of sugary foods and drinks — particularly between meals — limits the amount of acid produced by plaque bacteria. Drinking water after meals can also help rinse away food particles.
Regular Examinations
Attending dental check-ups at recommended intervals allows early detection of cavities and other dental issues. Your dentist can identify problems before they become more complex and advise on preventive strategies.
Temporary Precautions Before Dental Assessment
If you suspect a cavity, the following general measures may help manage comfort while professional assessment is arranged. These do not replace professional dental care.
Recommended
Maintain good oral hygiene — continue brushing and cleaning between teeth.
Avoid sugary foods and drinks if a tooth feels sensitive.
Avoid chewing on the affected side if eating causes discomfort.
Use fluoride toothpaste to support enamel strength.
Arrange professional dental assessment at your earliest convenience.
Avoid
Do not attempt to fill or repair a cavity yourself.
Do not ignore persistent tooth pain or sensitivity.
Avoid very hot or very cold foods if they trigger discomfort.
Do not delay professional assessment if symptoms are worsening.
Avoid placing aspirin directly on the tooth or gum tissue.
These measures are general guidance only and do not replace professional dental care. If you are experiencing pain or discomfort, please contact us to arrange an assessment.
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Frequently Asked Questions
Cavity Assessment
If you suspect a cavity or notice symptoms such as tooth sensitivity or visible damage, professional dental assessment can help determine whether restorative treatment may be appropriate.
Professional Cavity Care
Whether you need a routine filling or more extensive restorative treatment, our South Kensington team can assess the condition of your teeth and recommend the most appropriate solution for your situation.
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