The problem expressed by you is very common even though you brush twice a day there is every possibility of badodour (halitosis) might be thr brushong techinchque that you are using should b changed condult a dentist near by and educate yourself on how to brush teeth and kindly get your teeth cleaned up by dentist where the dentist uses ultrasonic scaler which can explore all the areas of your oral cavity where the normal tooth brush doesnt pass and its mandatory that early twice one should get his/her teeth cleaned by dentist and drink lots of water and maintenance after treatment so much important thank you and hope this information would b helpful