Get your check-up done. Smell can be due to Calculus and plaque on teeth Throat infection Stomach issues. Get your check up done. For plaque and calculus, get it removed from dentist. Brush twice a day, use tongue cleaner,  take any mouthwash and rinse with it, dont eat anythin after brushing at night, rinse after every meal. 

thr can b no. of factors responsible for same.chk if u r having any stomach issues.brush twice and rinse with water after every meal .and night tym brushing is very very important.chk inner side of your teeth if u see sone white to yellow deposits thn u need professional cleaning. visit to ur nearby trusted dentist n get scaling done

Please get the check up done as there are many factors responsible for the same. For now please brush twice a day and rinse your mouth after every meal. It should help you a bit .