Brushing your teeth properly at least twice a day helps prevent tooth decay and gum disease. Here are tips to proper brushing:

• Brush your teeth for two to three minutes
• Avoid hard scrubbing
• Hold your toothbrush at a 45-degree angle and gently brush in short strokes from where the tooth and gum meet to the top of the tooth
• Brush all outside and inside surfaces
• Clean the pits and crevices on the chewing surface of your teeth with short sweeping strokes
• Brush your tongue to remove bacteria and freshen your breath
• Talk to your dentist about proper brushing techniques

Reference: https://www.youroralhealth.ca/personal-oral-care/brushing-techniques