Plaque and tartar are terms most people have heard and used vaguely interchangeably. They are related but different substances requiring different interventions. Understanding the distinction changes what you should be doing about them.
Plaque: the living biofilm
Dental plaque is a sticky biofilm of bacteria and their products adhering to tooth surfaces. It forms continuously. Within hours of a thorough cleaning bacteria begin to adhere to tooth surfaces. Within 24 to 48 hours this community has organized into a complex biofilm. Plaque is the primary driver of both cavities and gum disease. The solution to plaque is mechanical removal. Brushing and flossing disrupt the biofilm before it matures into its most pathogenic state.
Tartar: the mineralized problem
If plaque is left undisturbed for long enough typically a couple of weeks or more the minerals naturally present in saliva begin to deposit within and around the plaque biofilm hardening it into tartar also called calculus. Calculus is no longer soft. It is mineralized and firmly adhered to the tooth surface. Once calculus has formed toothbrushing and flossing cannot remove it. This is removed by professional dental instruments only.
| Plaque | Tartar (Calculus) | |
|---|---|---|
| Composition | Soft bacterial biofilm | Mineralized hardened deposits |
| Can brushing remove it? | Yes | No — requires professional instruments |
| Prevention | Consistent brushing and flossing | Brushing and flossing plus professional cleanings |
For people who build calculus quickly more frequent professional cleanings make sense. For the bacterial side oral probiotics can shift the composition of the plaque biofilm toward less pathogenic communities over time. Our supplement comparison covers products with evidence for this approach.
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