Visit your dentist and get the filling checked. Till then,apply Mucopain gel. Rinse with Chlorhexideine mouthwash.

I think u should visit dentist once because may be there was impingement of instrument in your tongue ya sharpness of material

Hiii, firslty sorry about the ulcer .. I believe the tooth filling is sharp at some point which needs to be rounded up. You can go to previous dentist for doing so. There are lot of medication available OTC for ulcer one of them is lignocaine gel. This will help you with the ulcer and start using 0.2% chlorhex mouthwash for the dryness. Once the filling is even, ulcers and other problems will disappear.

Visit your dentist and get the filling checked for any sharp edges

Hi, Please meet the dentist again. You may require some height adjustment and smoothening of the filling margins.

Use mouthwash and gel visit the dentist