Two minutes, twice a day, with a fluoride toothpaste. The evening matters more than the morning: at night saliva flows less and protects the teeth less.
A soft brush is enough. A hard brush and a heavy hand do not remove more plaque; they wear the gum away at the neck of the teeth. Angle the brush towards the gum and make small movements, tooth by tooth, rather than long strokes.
After brushing, spit but do not rinse: the fluoride stays on the teeth. Change your brush every three months, or sooner if the bristles splay.
Brushing does not clean between the teeth. Floss or an interdental brush, once a day, does that. If your gums bleed at first, that is no reason to stop; if they still bleed after two weeks, mention it to the dentist.
Four notes from the practice on everyday care. They do not replace a consultation: for your own case, the dentist answers after examining you.