by Lavina Choie on 25/3/2026
Most people think brushing removes everything.
It doesn’t.
Even with good daily oral health routine, plaque begins forming on your teeth within minutes of eating. And if it isn’t removed thoroughly, it can harden into tartar, something you cannot remove by brushing alone.
Understanding how this happens makes it much clearer why professional cleaning is necessary.
Plaque — also called biofilm — is a sticky layer of bacteria that is constantly forming on the surface of your teeth and along the gumline.
It feeds on sugars from food and drinks. As bacteria metabolise these sugars, they produce acids. These acids can weaken enamel and irritate gum tissue.
Plaque is soft and invisible at first. That's why you don’t always notice it building up.
The process starts quickly.
Immediately after eating, bacteria begin forming biofilm — especially after sugary or starchy foods. At this stage, the layer is thin and easier to remove with brushing and flossing.
Around 20 minutes later, the biofilm thickens. It becomes more structured and more resistant to saliva’s natural cleaning action.
Within a few hours, if not disturbed by brushing and flossing, the biofilm becomes denser and stickier. Bacteria are well established, producing acids in an environment that protects them.
This cycle repeats every day.
If plaque isn’t properly removed, minerals from saliva begin to bind to it.
Over time — often within 24 to 72 hours — it hardens into calculus, commonly known as tartar.
Once tartar forms:
Tartar acts like a scaffold for more bacteria to accumulate.
This is why even people who brush daily can still develop gum disease if hardened build-up isn’t removed professionally.
Brushing is essential. But it has limits.
Small areas that are consistently missed allow plaque to mature and harden.
That doesn’t mean you’re doing something wrong. It simply means that home care and professional care work together.
A professional teeth clean removes hardened tartar safely and thoroughly.
By eliminating the rough surfaces where bacteria thrive, hygiene visits will help reduce gum inflammation; lower bacterial load; help prevent periodontal disease; and make daily brushing more effective.
Without periodic removal of tartar, plaque continues to build on top of existing deposits, increasing the risk of long-term damage.
Plaque formation is continuous. So prevention must be continuous too.
At Dunedin Dental, hygiene appointments are designed to break the plaque-to-tartar cycle before it leads to gum disease or more complex treatment.