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That is tooth #31. It erupted in your mouth about the age of 12. It should NOT be loose.
Can you get to a Dentist soon? So he or she can figure out "why" it is loose, and with the idea to fix and hopefully have it strengthened? That is specifically what I would recommend , and highly so, to get to your Dentist of choice asap...
Does the above info. make sense? Getting to the Dentist quickly, to hopefully let him assess what needs to be done and hopefully make the tooth strong again?
*Please let me know if you have additional concern/s OK? Thanks!