Greetings, nothing to worry.
It seems like a part of your milky tooth. Get an x-ray done in order to confirm it.
Apart from that there is a cavity on your 1st molar.
Get it filled before it becomes large.
If you need any further advice or help then you can consult me on practo.
All your queries will be solved.
Regards: Dr Akash Bhagat
The Dentist's Office
Next Steps
visit a dental clinic . get an xray done
Health Tips
avoid any delay