Oral hygiene involves keeping the mouth clean to prevent disease and increase comfort. Proper oral hygiene includes brushing teeth twice daily, flossing daily, eating a balanced diet, and using fluoride products. Brushing should use a gentle back-and-forth motion at a 45 degree angle, while flossing removes food from between teeth. Plaque and bacteria in the mouth can cause cavities if not removed regularly. Maintaining good oral hygiene is important for overall health and was emphasized by the Prophet Muhammad.