Brushing correctly is not enough - Floss regularly if you really love your teeth.
Getting in between the teeth with dental floss cleans away the plaque where the toothbrush cannot reach and therefore helps prevent tooth decay and gum disease.
Gently slip the floss between two teeth in turn, wrap around either the back or front surface, and sweep upwards. Repeat in the same space between the same teeth but wrapping in the other direction.
Floss every day for ultra clean teeth and fresh breath.