Top tips for keeping your teeth healthy. Life processes - Humans and other animals - Teeth Learning Points Bacteria in the mouth produce plaque. Acid produced by plaque attacks the enamel on teeth. Brushing teeth twice a day helps prevent tooth decay and gum disease. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.