I just took my 7 year old for a dental check up. They found a cavity in her back molar and he filled it then and there. The thing that confuses me is he said it was a permanent tooth that had to last her til she's 95. I said its her baby tooth it hadn't fallen out and grown back and he said it won't and that it grows in as a permanent tooth. Is he for real?? I've never heard that before.

Also, 2 hours on and her check is a little swollen. Is that normal? I don't recall looking swollen after a filling. She said it hurt during the procedure and he said it was quite deep so it might of hurt a bit but that she was also just worked up and anxious.

Plus, the actual filling has a greenish grey tinge and is described as ' metallic restoration'. My fillings are white/cream colour.