You brush thoroughly, rinse, and feel clean. Within minutes, proteins from your saliva form a thin film on your teeth β€” a landing pad for bacteria.

Within 1-4 hours, bacteria start colonizing. In 4-24 hours, they build a protective fortress around themselves. At this point, plaque can no longer be rinsed away β€” it must be scraped off.

After 24-48 hours, bacteria begin producing acid that demineralizes your enamel. This stage is still reversible β€” saliva minerals can repair the damage. But if acid attacks persist, the damage outpaces repair.

After days to weeks: a cavity forms in the dentin. At this point, the damage is permanent. If untreated, decay reaches the pulp β€” causing pain β€” and you need a root canal or extraction.

The entire process happens silently. No pain, no visible change in early stages. By the time you feel it, the damage has been progressing for weeks. Brush twice a day, floss, and reduce sugar. Prevention is boring, but it beats the drill.