Emily was eating some chips and salsa with her lunch this afternoon. All of a sudden, after taking a bite, she starts getting all excited and squealing (because she had food in her mouth still) and pointing. Apparently, she bit the chip just the right way to cause her to lose a tooth!
Yes, that is a filling in the tooth. When Emily was little, for some reason her teeth were very soft, and she kept getting cavities in them until she was almost four years old. She has since had no more cavities, and all of the teeth that she did have the cavities in will be falling out and replaced by permanent teeth eventually.