Tooth decay is one of the most common dental problems affecting both children and adults. It is a chronic disease that gradually destroys hard dental tissues – enamel, dentin, and cementum.
If not detected and treated in time, tooth decay advances deeper and can lead to serious complications, from severe tooth pain to tooth loss.
The good news is that tooth decay can be prevented, and if it has already developed – it can be treated successfully.
In this text, we explain how it develops, how to recognize it, how it looks in different phases, and what you can do to protect your teeth.
What is tooth decay
Tooth decay is a chronic disease of the teeth that develops as a result of bacteria acting on hard dental tissues. The process begins on the surface of the tooth and then gradually spreads inward.
A tooth is composed of several layers. The outer layer – enamel – is the hardest tissue in the human body and serves as a protective shield. Beneath the enamel is dentin, softer tissue that makes up most of the tooth. In the very center of the tooth is the pulp (nerve), which contains blood vessels and nerves.
Tooth decay first attacks the enamel.
At this stage, there are often no symptoms and the patient is not aware of the problem. When tooth decay breaks through the enamel and reaches the dentin, the first signs appear – sensitivity, pain from hot, cold, or sweet. If left untreated, tooth decay reaches the pulp and then nerve inflammation occurs, severe pain, and the need for much more complex treatment.
How does tooth decay look
Many people wonder how tooth decay looks, especially in early stages when it is difficult to notice with the naked eye.
In the initial stage, tooth decay appears as a white or light brown spot on the tooth surface. This is called enamel decay – at this stage there is still no cavity, but only an area where the enamel has begun to lose minerals. This type of decay can be relatively easily treated by a dentist.
As it progresses, the spot becomes darker – taking on a brown or black color. At the site of enamel damage, a cavity (caries lesion) forms that is visible or can be felt with the tongue.
In advanced stages, tooth decay affects a larger part of the tooth. The cavity expands, the tooth can crack when chewing, and pain becomes constant.
It is important to know that tooth decay is not always visible.
It often develops between two teeth or beneath an existing filling, where only a dentist can detect it using examination or X-ray imaging. This is precisely why regular checkups every six months are of critical importance.
Tooth decay – causes of development
The main culprit for tooth decay is dental plaque – a colorless, sticky film that constantly forms on the tooth surface. Plaque develops as a result of bacterial growth in the oral cavity.
Bacteria from plaque use sugars from food and drinks as fuel to produce acids. These acids attack the enamel and gradually destroy it. Tooth decay appears exactly at the place where this happens.
The most important factors that contribute to tooth decay are:
Diet rich in sugar. Sweets, carbonated beverages, commercial fruit juices, and all foods with high sugar content directly feed the bacteria in the oral cavity. The more often you consume these foods, especially between meals, the higher the risk.
Inadequate oral hygiene. Irregular or incorrect tooth brushing allows plaque to accumulate and harden. If plaque is not removed regularly, it eventually turns into tartar that can only be removed by a dentist.
Dry mouth. Saliva has a protective role – it rinses away food debris and neutralizes acids. Reduced saliva production (which can be caused by certain medications or health conditions) increases the risk of tooth decay.
Tooth anatomy. Molars and premolars are especially prone to decay because they have many grooves and fissures where food is easily retained and where a toothbrush cannot reach easily.
Tooth decay most often occurs on molars and premolars, where food is most easily retained, as well as in spaces between teeth where a toothbrush cannot reach easily.
Tooth decay or tartar – how to tell them apart
Tooth decay and tartar are two different problems, but many people confuse them because they appear in similar places on the teeth.
Tartar is actually hardened dental plaque. It forms as a hard, yellowish or brownish deposit on the gum line and between teeth. Unlike soft plaque that can be removed with a toothbrush, tartar requires professional cleaning by a dentist – using ultrasonic instruments or manual scalers.
Tooth decay is damage to the tooth tissue itself – a hole in the tooth that develops from the action of acids from plaque. While tartar is a deposit on the tooth, tooth decay is destruction in the tooth.
Both problems are related: if plaque is not cleaned regularly, it turns into tartar, and bacteria from that same plaque simultaneously produce acids that create decay. Neglecting tartar can also lead to gum recession, tooth shifting, and bone loss.
The key difference is in treatment – tartar is removed by cleaning, while tooth decay requires filling or more complex intervention.
Symptoms of tooth decay
In early stages, tooth decay often shows no symptoms. This is precisely what makes it dangerous – many patients are not aware they have decay until it becomes a serious problem.
As the disease progresses, the following signs may occur:
Tooth sensitivity – sharp, brief pain when consuming cold, hot, or sweet food and drinks. This is usually the first signal that decay has passed through the enamel and reached the dentin.
Visible changes on the tooth – dark spots, color change, or visible cavity on the tooth surface.
Spontaneous toothache – pain that occurs without a specific trigger, especially at night. This indicates that decay has probably reached the pulp.
Unpleasant taste or bad breath – bacteria in the decay cavity can produce an unpleasant odor.
Swelling of the gums or face – in advanced stages, the infection can spread to surrounding tissues and cause swelling, pus formation, and serious complications.
How diagnosis is made
Tooth decay is diagnosed through examination by a dentist, with the help of X-rays that reveal what is not visible to the naked eye – especially decay between teeth or beneath fillings.
Important: If you do not feel pain, it does not mean you don’t have decay. Regular checkups are the only sure way to detect the problem in time.
Tooth decay in primary teeth
Children are especially susceptible to tooth decay. Primary (baby) teeth have a thinner layer of enamel than permanent teeth, which means decay progresses through them faster.
Decay in primary teeth usually develops early and is most often the result of:
- frequent consumption of juices and sweets
- prolonged bottle use, especially at night
- improper tooth brushing by parents
- insufficient parental awareness of the importance of primary teeth
Many parents believe that primary teeth “don’t matter because they will fall out anyway.” This is a serious misconception. Primary teeth hold space for permanent teeth, allow the child to chew and speak properly, and affect the development of the jaw. Decay in primary teeth, if left untreated, can damage the permanent tooth bud developing beneath it.
Tooth decay on front teeth in children
The most severe form of decay in young children is called early childhood caries or bottle syndrome. It occurs in children who are given a bottle with juice or sweetened milk, or a pacifier dipped in honey, for an extended period before sleep.
Decay in this case usually first affects the upper front teeth (incisors) and then spreads to other upper teeth. Lower teeth are usually protected by the tongue.
Early treatment is extremely important because this process can be very painful for the child, and in severe cases requires treatment under general anesthesia.
Treatment of tooth decay
The method of treating tooth decay depends on how advanced the disease is.
Initial decay (enamel decay) – In the earliest stage, when only a demineralized spot has developed without a cavity, remineralization is possible through the application of fluoride or icon treatment. The dentist can apply concentrated fluoride preparations that help the enamel to be restored.
Dentin decay without pulp involvement – The dentist removes the tissue damaged by decay, cleans the cavity, and fills it with a composite restoration (filling). If the decay was close to the pulp but the nerve is still healthy, a protective preparation based on calcium hydroxide is first placed, followed by a temporary restoration for about 30 days. After that recovery period, a permanent restoration is placed.
Decay that has reached the nerve – When decay breaks through both the enamel and dentin and reaches the pulp (nerve), endodontic treatment is necessary – cleaning and filling the root canals of the tooth. This is a more complex procedure, but it allows the tooth to be saved.
Completely destroyed tooth – In the most severe cases, when the tooth can no longer be restored, the only solution is tooth extraction and planning for replacement (bridge, implant).
Tooth decay most often occurs on molars and premolars, where food is most easily retained, as well as in spaces between teeth where a toothbrush cannot reach easily.
Prevention of tooth decay
Tooth decay can be prevented to a large extent. Prevention is simpler, less expensive, and painless compared to treatment.
Proper tooth brushing – Teeth should be brushed at least twice daily, in the morning and evening, with toothpaste containing fluoride. Brushing should last a minimum of two minutes with proper technique.
Use of additional hygiene products – Interdental brushes or dental floss are necessary for cleaning spaces between teeth, where a regular toothbrush cannot reach. Antibacterial mouthwash sometimes additionally reduces the amount of bacteria.
Controlled diet – Limit the intake of sweets, carbonated beverages, and foods rich in sugar. If you consume them, it is better to do so with a main meal rather than between meals.
Application of fluoride – Fluoride helps in remineralization of the enamel and makes it more resistant to the effects of acids. In addition to toothpaste, a dentist can locally apply concentrated fluoride preparations.
Fissure sealing – This is most often done in children with primary and permanent dentition, although it can also be done in adults. It is performed on healthy teeth and involves applying sealant to the indentations on the chewing surface of teeth. This way a flat surface is created where there is no possibility for food to be retained.
Regular dental visits – Checkups every six months allow decay to be detected in its early stage, when treatment is simplest. Decay initially does not hurt – the dentist detects it before you feel any symptoms.