A psychologist has described a unique case, new to science. A 38-year-old fit and healthy man suffered memory loss after a local anesthetic and root-canal treatment at his dentist. For the past decade he can only remember up to 90 minutes. Symptoms are akin to those depicted in movies such as Groundhog Day and Memento. And, there is no evidence that the treatment at the dentist can be blamed for his condition. He is fully aware of his identity and his personality did not change — but every day the man thinks it is the day of his dental appointment.

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