A 60-year-old woman undergoing dental implant surgery at a Swedish hospital learned the hard way that visits to the dentists never end well when the dental drill being used on her came loose and slid down her throat.

Thinkstock

A 60-year-old woman undergoing dental implant surgery at a Swedish hospital learned the hard way that visits to the dentists never end well when the dental drill being used on her came loose and slid down her throat.

Thinkstock