This discovery surprised everyone. Trauma to the back of the head was the only major wound on the body of the deceased. It was obviously the cause of death. After six years, the murderer had actually used another method of murder.

Peng Sijue supported the deceased's head and observed calmly. Then he pried open the lips of the deceased. Generally, if the back of the head had suffered a huge impact, there would be bleeding in the mouth and nasal cavity. Only the deceased's teeth were covered with blood.

He poked the teeth with a latex-gloved hand, and found that her front teeth were loose. He asked his subordinates for an iron ruler.

He pried apart the victim’s top and bottom teeth with the iron rule. "Several teeth are loose and there’s wear on the teeth. There are spots of bleeding  on the gums... Someone has pried...