What attacks the tooth tissue?
Bacteria in biofilm turn sugar into acids. If more minerals are lost than replaced over time, tooth tissue can be damaged.
← All explanationsTooth decay
Does tooth decay always mean a cavity?
Tooth decay is a disease of the hard tooth tissues. Bacteria in plaque turn sugar into acids that can dissolve minerals. At first, the surface may remain intact. A cavity forms only when further tooth tissue is lost.
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Acids dissolve minerals
Bacteria in dental plaque convert sugar into acids. If mineral loss outweighs replacement over time, the tooth tissue can be damaged.
Early decay is not yet a cavity
An early change can occur beneath an intact surface. Saliva, fluoride and suitable care can help stop the process.
Lost tooth shape does not regrow
When the surface breaks down, tooth tissue has been lost. The resulting cavity does not close by itself; treatment depends on the findings.
At a glance
Is tooth decay a cavity from the start?
Early changes may lie beneath a still-intact surface. A white spot alone, however, does not prove there is decay.
When can the process still be influenced?
In early changes, fluoride, saliva and suitable care can help stop the process. They do not rebuild tooth shape that has already been lost.
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Often confused
Tooth decay or erosion?
In tooth decay, bacteria produce the acids. Erosion is caused by acids from other sources, such as food or stomach contents. Both can damage tooth tissue.
Quick answers
Is every white spot tooth decay?
No. White areas can have different causes. Colour or a photograph alone is not enough for a reliable assessment.
Why does the frequency of sugar intake matter?
Repeated sugar intake enables repeated acid production in the biofilm. This leaves less time for the mineral balance to recover.
Can toothpaste repair a cavity?
Fluoride supports mineralisation in early changes. Toothpaste cannot rebuild tooth shape that has already been lost.
At the practice
For your consultation
A question to discuss with Dr. med. dent. Niusha Barahmand Pour:
Is the tooth surface still intact, and which treatment can preserve as much of the existing tooth tissue as possible?
Preserving teeth and a functioning bite are central to her practice profile, alongside aesthetic treatment.
An examination helps assess unusual areas on teeth and discuss the next steps.
Have your teeth examinedChoose an appointment on DoctolibLearning for dental trainees & teamsUnderstand clinical terms and build your knowledge
Build on the simple explanation with clinical terms, key distinctions and a knowledge question.
- Demineralisation
- Loss of minerals from hard tooth tissue. In tooth decay, acids from bacterial biofilm cause this loss.
- Remineralisation
- The return of minerals to remaining hard tooth tissue. Saliva and fluoride can support this process.
- Cavity
- A defect where the tooth surface has broken down. Remineralisation does not regrow the lost tooth shape.
Know the difference
An early decay lesion can still have an intact surface. Remineralisation is not the same as closing an existing cavity.
Sources for further learning
Sources and context
Editorial research: 22 October 2026. This explanation covers general principles and does not replace a personal examination. Suitable treatment is discussed following individual assessment.