Next, wrap the floss around your tooth and scrape it up and down. This removes stubborn plaque and polishes the surface. Repeat the process on each tooth till they are well and truly flossed. Rinse your mouth. You could brush your teeth before or after flossing, it does not matter.
Some people prefer flossing first and then brushing the loose ends away.
Diet is of prime importance and yes, sugar is the bad guy. Sorry, there's no getting away from it. Sugar attaches plaque to teeth so if you must indulge, wash your mouth afterwards. What you should include in your diet though is plenty of calcium, Vitamin B and C and proteins. Besides a healthy diet, eat foods that require enough chewing.