Is it realistically possible to die from an air embolism from that air thing at the dentist's office?

They have those high pressure water and air things and they spray it right into the dental work. Is there a chance that the air will enter the bloodstream and cause an embolism? And if so, how frequent is this?
Update: blond... it has happened to people refilling the air in their tires, how could this be so different?
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