Donald Harris, 57, from Indiana, reportedly used the same bottle of mouthwash for four years without ever replacing its contents.
According to authorities, Harris believed the product worked as a multipurpose disinfectant that could be reused indefinitely. After every rinse, he poured the liquid he had just used back into the bottle, repeating the routine for years without realizing what was accumulating inside.
The bacterial buildup reportedly went unnoticed until Harris visited a clinic and described his unusual habit. However, the available account does not provide details about his diagnosis or current health condition, so the actual medical consequences remain unclear.
The unusual story quickly spread across social media, where users reacted with disbelief, disgust and jokes about the bizarre routine.
For many people, the most surprising part was that such a simple household mistake had continued for four years, or approximately 1,460 days.
