filling makes it hard to floss

[toothsaver]

A new filling is sharp, and cuts my floss. Is there any way I can file it down myself?
How do I prevent this from happening in the future? Should I ask the dentist to let me stick a piece of floss, so that when he is putting in a filling, I can immediately floss the edge before it hardens into jaggedness?

 

[Zuri Barniv]

Your dentist should have checked this before you left. Ask your dentist to repair it. Do not try to do anything yourself, you will not be successful and could do damage.