If a mercury filling came loose and was accidentally inhaled, could it be removed from the lungs?

Aspiration: Aspirated debris can be removed, but chances are you will cough it out. Are your fillings loose? See a dentist for care to help prevent the above scenario.

X-Xray: See your GP.,x-ray may be required to determine location of filling. If in your lungs must be removed. If in GI tract will pass naturally. If filling came loose it means fracture or decay adjacent to filling, and this requires immediate care by your Dentist. Sounds like you are overdue for a thorough dental examination.