Hi sir
The bad smell from mouth may due to following reason,
1. Deposits in teeth, - Needs professional cleaning
2. May be due to habits( smoking, drinking, tobacco chewing), - needs professional cleaning and quiting those habits
3. Due to caries tooth ( decay) - needs restoration or RCT or extraction
4. Deposits on tongue- please clean it with brush daily
5.you may have ulcer problem - needs medical help
6.
Diabetes - needs medical attention
Next Steps
Please do visit the dentist and check for above reasons
Health Tips
Continue your oral hygiene habits as usual along with tongue cleaning sir
Hope this helps you sir