1, “green drink” is the best way to fight bad breath. This green drink can use wheat grass, alfalfa sprout juice and barley grass juice as the main ingredients, a glass of chlorophyll juice every day (a glass of water, two tablespoons of chlorophyll juice), the effect is good. 2, eat 250 mg of vitamin C every day, about a quarter of the current commercially available vitamin C a. Take vitamin C can help restore healthy gums and prevent bleeding gums, and eliminate excessive mucosal secretions and waste in the mouth (these substances are one of the factors that cause bad breath). 3, after eating, brush your teeth and tongue, and also use dental floss to remove the meat and vegetable scraps in the crevices of your teeth to remove the dirt. In addition, it is best to get a new toothbrush every month to prevent the accumulation of bacteria on the toothbrush. 4, eat more lettuce, because vegetables contain a lot of fiber, can help digestion, solve the problem of constipation; but lettuce is best to buy organic vegetables without pesticides and fertilizers pollution, so as to eat up peace of mind and effective.