The life of a successful dentist seems perfect until the shadows of the past begin to lurk. Dr. Alan Feinstone is an admired professional married to a woman who appears to have it all, but his world takes a dark turn when he discovers that his wife is unfaithful. Instead of confronting her rationally, madness creeps into his mind, leading him to develop a dangerous obsession that transforms him into a completely different man.
As rage and jealousy take hold of him, he begins to see his patients not just as individuals, but as symbols of his frustration and betrayal. In a whirlwind of paranoia, he decides to take justice into his own hands, leading to torture and brutal acts in his dental practice. Each treatment becomes a terrifying and twisted experience; he becomes a kind of "vigilante" punishing those he deems dishonest.
Things spiral out of control when bodies start appearing around him, drawing the attention of the authorities. As tensions rise, Dr. Feinstone must grapple with his mental deterioration and the imminent dangers he faces. The film delves into a climactic journey between madness and reality, questioning the meaning of morality and the limits of the human psyche in an environment that should be trustworthy.