I have some concerns about the quality of work of some recent composite
fillings. My dentist replaced most of the old amalgam fillings in one
quadrant of my mouth.

All the fillings feel significantly rougher than the old amalgams and
the tooth enamel, and one feels higher than it used to - like the
occusal surface is filled with stuck food. It also has a sharp ridge of
material along one of the cusps that I can feel with both my tongue and
a fingernail.

My back molar had a broad, sharp overhang of filling material near the
gum line. In flossing over the last few days, I have snapped off off
several significant (3-4 mm wide, 1-2 mm thick) chips of this
overhanging composite. The back of the tooth is now smooth again, but I
don't know if the chips were critical pieces of the filling or
untrimmed excess.

I have scheduled an appointment to have these fillings reexamined and
treated.

Are these normal problems with composite fillings? I never had these
issues with my amalgam fillings. I'm supposed to have the dentist (a
recent graduate of a well-regarded school) work on other quadrants
soon, and I'm now leery of continuing with him.