Know Your Mouth

GamesArcade · one fact

By ·Updated 15 September 2026

48 Hours

Plaque starts to mineralise within one to three days and is largely set hard within about twelve. The brushable window is roughly the first two days. Keep eight teeth clean for as many days as you can.

The game needs JavaScript, which appears to be switched off. The one fact it teaches is in the article below, and in plaque vs tartar.

Most people picture plaque and tartar as the same thing at different ages, which is true, and picture the ageing as slow, which is not. The window between a film you can wipe off and a deposit that needs a steel instrument is about two days. The game above is that window with a clock on it; the rest of this page is where the number comes from and what the game leaves out.

What the game is teaching

Plaque is a soft biofilm that begins forming on a clean tooth within hours; everyone has it, continuously. Leave it undisturbed and calcium and phosphate dissolved in your own saliva — the same minerals that repair enamel — precipitate into it and set it hard. Within roughly 24 to 72 hours, soft biofilm becomes tartar, bonded firmly to the tooth. At that point brushing does nothing, and neither does flossing, oil pulling, charcoal or any rinse; a dentist or hygienist with an instrument is the entire list of options. The game rounds the window to 48 hours because a game needs one number, and the article it is built on gives the range.

It is not a rare failure state. In a representative sample of 758 adults aged 35 to 59 in Porto Alegre, the researchers found calculus on 44.6% of the sites they examined, against gingivitis on 26.1%. Hardened deposit is the normal condition of an adult mouth, which is another way of saying most people lose this game slowly in real life without noticing.

Why the night-time brush matters more than the morning one

The game’s sleep event is eight hours at double speed with brushing disabled, and it is the event that ends most games, because anything you left on at bedtime is a third of the way to tartar by morning. The real mechanism is saliva. Saliva rinses debris away, buffers acid and carries the minerals enamel is repaired with, and it does all of that far less overnight: flow falls during sleep, and mouth breathing — the reason morning dryness is so much worse than daytime — dries what is left. Plaque you leave on at night sits in a mouth with its cleaning system mostly switched off for seven or eight hours. The morning brush removes what formed overnight; the night brush decides how much there is to form. What saliva is actually doing covers the four jobs in full, and why a dry mouth decays faster.

What tartar does that plaque does not

Tartar is not merely hardened plaque sitting there inertly. It is rough and porous, which makes it an excellent surface for new plaque to attach to — and it holds that new plaque tight against the gum margin, exactly where it does damage. So the process accelerates: tartar collects plaque, that plaque mineralises, the deposit grows, and the gum inflames against it. That inflammation is gingivitis, the first and reversible stage of gum disease; left long enough, with the deposit still there, it becomes the second stage, which costs bone that does not come back. In the game a tooth is “lost” at three deposits. In a mouth, the early signs arrive well before that, and the first of them is bleeding when you brush.

What this game gets wrong on purpose

  • The clock is a caricature. The real window is roughly 24 to 72 hours and it varies by person: saliva flow and mineral content differ, and tartar forms fastest opposite the salivary gland openings — inside the lower front teeth, outside the upper back molars — because that is where the minerals are. The game gives every tooth the same 48.
  • The dentist is not a power-up. Removing tartar takes a scaling appointment with a dentist or hygienist, not a tap on an icon, and the important half of it happens below the gum margin where you cannot see. What a dental cleaning actually does is the honest version.
  • Sugar and water are stand-ins. Frequency of eating matters more than amount, and the acid from plaque is the caries mechanism, not the tartar one; the events are there for pace, not physiology.
  • Teeth are not lost at three deposits. They are lost, eventually, to the gum and bone disease that tartar drives — over years, with warnings, and mostly preventably.

Nothing you do here is sent anywhere

The game is about twenty kilobytes of JavaScript drawing on one canvas, all of it inside this page. There is no request, no upload and no analytics on the game. The only thing it keeps is a small record in your own browser — your best score, whether sound is on, and that you have seen the instructions; if your browser refuses that, it plays anyway and simply does not remember. That is not a privacy promise you have to take on trust — open your browser’s network tab and watch nothing happen.

This is a game about one number, not advice about your mouth. Nothing here is medical or dental advice; see a dentist about your own teeth, particularly for pain, bleeding or anything that has changed.

Our illustrations and tools are free to reuse under CC BY 4.0 — see the diagrams page.

Correction, 15 September 2026

The line above the game used to say that a spot left about 48 hours is set hard by your own saliva and that no brush removes it. It now says that plaque starts to mineralise within one to three days and is largely set hard within about twelve, with the brushable window roughly the first two days — the timing in Jin and Yip’s 2002 review. The game’s clock has not changed; the sentence describing it has. Our corrections policy is to say so on the page.

References

  1. Jin Y, Yip HK. Supragingival calculus: formation and control. Crit Rev Oral Biol Med 2002;13(5):426–441. DOI · PubMed · Funding: see ledger
  2. Haas AN, et al. Occurrence and predictors of gingivitis and supragingival calculus in a population of Brazilian adults. Braz Oral Res 2019;33:e036. DOI · PubMed · Funding: see ledger

Read next