Need to check thoroughly that whether it's done properly or not. Main thing is if it's not causing any problem to you, like high point, any sensitivity etc, then it's fine. You can brush, no need to worry about it. Still have queries then you can consult me online or offline for better guidance and treatment options.

Hello... As long as you’re comfortable that you don’t have sensitivity, you can close your mouth normally, you can eat from that side...the filling should be fine from your side. Rest I think your dentist might have taken an x-ray on his side to be sure so don’t worry. You can brush your teeth and start using the side as you used to.

Filling is done well or not can be judged clinically only and with xray. You can certainly brush your teeth now.

Its metallic filling amalgam or miracle we have to check... its advised to get tooth colored filling like GIC and composite.  Not this. So u can get the refilling done.. You can brush after half an hour of any filling.