The criminal, whose oral hygiene clearly left something to be desired, had bent, yellow and marked teeth as well as a dry mouth and a conspicuous cold sore.
The 42-year-old dentist's professional point-of-view apparently helped him to recall the man's mouth very clearly for police artists.
The robbers broke into Marcus B.'s practice in the small town of Fichtenwalde in Brandenburg on March 26 and brutally attacked him, slamming his head against a door frame.
The two men, believed to be aged about 20, then trapped the dentist's left index finger in a pair of garden shears and demanded money. Even though the victim gave them some cash, they cut off his finger and fled.
Police are now using the identikit pictures to search for the two men. The dentist described them as around 1.80 metres in height. "They were both slim, had dark, scraggy hair, wore dark hooded tops, looked unkempt and spoke broken German," a police spokesman said.
The dentist, who was about to lock up for the evening, reportedly gave himself first aid and then sought help in a neighbouring shopping centre. He was given an emergency operation in the nearby town of Potsdam.
Despite an extensive search, there is also still no trace of the finger.