Brushing at least twice a day, preferably after you wake up and before you go to bed, helps prevent plaque from building up in your gums while you're awake and asleep.
Plaque can lead to tooth decay, gum disease, and cavities. If plaque isn’t removed, it can harden into tartar. Tartar can make it harder to clean your teeth and may lead to gingivitis, an early stage of gum
disease.
Brushing for two minutes also helps ensure that you reach all the areas of your mouth that need attention. If you’re prone to cavities or frequently ingest sugary or acidic foods and drinks, brushing more often for longer periods of time is recommended.