My son is 2 years old he do brush daily before bath but after that’s also mouth smells after every sleep

A. Brush in the night also before sleeping maintain a proper hygiene by brushing twice use proper toothpaste and toothbrush suitable for kids Something like Babyhug because it is fluoride free and use proper toothbrush also and must tell you that if still the problem is persisting then you need to consult a dentist once