The object in question is the supernumerary tooth (mesiodens) the white arrow is pointing to. Fun note – there is resorption of the supernumerary tooth in the coronal portion of the tooth.
Which surface (buccal or lingual) is the supernumerary tooth in relation to the maxillary central incisors?
Answers coming Thursday. You can answer either in the comments, twitter (@DrGstoothpix) or wait. If you have any questions, please leave them below. Thanks and enjoy!