[header] How to prevent bad breath [title] Brush your teeth properly. [step] Brushing your teeth properly is one of the best things you can do in your fight against bad breath. Brush at least twice a day, for at least two minutes and make sure to cover all the areas in your mouth. 
Especially focus on where the teeth meet the gums. [substeps] Use a soft bristled brush and replace it every three to four months.