How does soft plaque become hard?
Minerals can become incorporated into soft plaque and harden it. Further deposits can attach more easily to the rough surface.
← All explanationsTartar
Why does soft dental plaque harden?
Tartar is hardened dental plaque. Minerals become incorporated into the soft deposit. Unlike fresh plaque, it cannot simply be brushed away. Tartar is removed at the dental practice using suitable instruments.
For dental trainees & teams
AI-generated
Choose a view
It starts with soft plaque
A biofilm of bacteria and other components forms on tooth surfaces. Regular cleaning removes this deposit while it is still soft.
Minerals harden the plaque
As minerals build up, soft plaque can become hard tartar. Its surface makes it easier for further deposits to accumulate.
Hard deposits cannot be brushed off
Tartar needs professional removal. Daily cleaning remains important to remove new soft plaque before it hardens.
At a glance
Where can hardened deposits develop?
They can form on visible tooth surfaces and below the gumline. Deposits below the gums are called subgingival calculus.
Why is a toothbrush not enough?
Already hardened deposits cannot simply be brushed off and need professional removal. Daily cleaning removes plaque while it is still soft.
Knowledge in motion
Explained in 36 seconds.
Three steps. Straight to the point.
Explanations are also shown on screen.
Silent film in German · English explanations in the three views above
Often confused
Tartar or staining?
Not every dark margin is tartar. Staining changes colour; tartar is a hardened deposit. An examination distinguishes the two.
Quick answers
Is tartar the same as plaque?
No. Plaque is a soft biofilm. Tartar forms when minerals cause this deposit to harden.
Can tartar form below the gumline?
Hard deposits can also develop below the gumline. These are called subgingival calculus.
Should I scrape off tartar myself?
No. Hardened deposits should be removed professionally. At home, careful brushing and suitable cleaning between teeth help control soft plaque.
At the practice
For your consultation
A question to discuss with Dr. med. dent. Niusha Barahmand Pour:
Where have hard deposits formed, and what kind of cleaning is suitable in those areas?
Preventive care, professional dental cleaning and preserving teeth are part of the treatment services described by her practice.
The practice can assess whether visible deposits are tartar and which cleaning approach is suitable.
Have deposits assessedChoose 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.
- Mineralisation
- The incorporation of minerals. In dental plaque, this can produce a hard deposit.
- Plaque
- Soft dental deposits that regular, suitable cleaning can remove from tooth surfaces.
- Tartar
- Mineralised dental plaque that cannot reliably be removed by brushing at home.
Know the difference
Tartar is a hard deposit; staining initially describes only a colour change. Colour alone is not enough to tell them apart.
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.