No, the Xrays disperse with distance. You likely got near to zero
exposure.

However, if you had, the symptoms might have included anxiety,
depression, sinus trouble, salivation, hair loss, stinky bowel
movements, and nervous twiching of the left side of your face.
Combined with loss of night vision. If you have any of these, please
go directly to the emergency room.

Remember, I'm not a doctor. Disregard every other paragraph.

Hello,

I was just at the dentist office today and the dentist performed an
panoramic xray on another patient in the same room as me. I was lying
on the chair about 7or 8 feet away without any protection. Should i be
concerned?

rj