Tooth brush should be changed every 3months.
if you have illness like fever, cold you have change the brush immediately.
Bcoz bacteria will b present in the toothbrush.Drink more water that will prevent dryness of mouth which creates bad breath.
Use soft bristles tooth brush
Next Steps
Change tooth brush every 3 months as well as when you r sick
Health Tips
Use softbristles tooth brush. if you have continous bad breath have a dental check up every 6 months, do teeth cleaning also