Hello ,
There are many reasons for having bad odour in the mouth after getting scaling done I'm listing few of them here :
1) the cleaning needs to be done more throughly in order to remove the deposits around your teeth
2) some gastrointestinal problems such as acidity , improper digestion can lead to bad odour to your mouth
3) some food that you are eating like onion ,garlic can lead to bad smell of the mouth
If it's either of the above then you need to see a dentist for deep scaling sitting
Next Steps
Check what is the most likely reason causing it.
Health Tips
Mouth was ll keep your mouth clean n odour free for a while but solving getting the problem diagnosed n solving it would increase your confidence as a bad breath can be problematic at times