Pree Namthip, 64, was found dead at the door of his house in Muang district having bled from the mouth, said Pol Lt Col Khamron Chanthip, a duty officer at Muang police station, who was alerted around 11.20pm on yesterday (June 17.
Several packs of pain relievers were found at the scene.
His niece, Mayuree Namthip, 29, told police that her uncle had complained of a toothache the day before, so he hired his neighbour, Tee, a butcher, to pull the tooth for B20 by using traditional methods.
One end of a string was tied to his rotting molar and the other to a stone. Tee then threw the stone and the tooth was yanked out.
However, Pree suffered excessive bleeding. He complained of severe pain and took several packs of pain killers, but nothing improved, said Ms Mayuree.
Pain relievers containing aspirin can thin blood and slow clotting.
On Wednesday night, her uncle died, prompting her to alert police.
Police interrogated his relatives and found that the man was also a heavy drinker and had several chronic illnesses. His relatives told police Mr Pree did not like to see doctors when ill.
His body was sent to Kamphaeng Phet Hospital to determine the official cause of death. Police, meanwhile, planned to summons Tee for questioning.