Deadpool's mouth was sewn shut in the first issue of his comic book series in 1991. This was done by Ajax, a villain who was torturing Deadpool, in an attempt to silence him.
Ajax believed that Deadpool's constant chatter and jokes were annoying and distracting, and he wanted to eliminate this distraction.
The sewn mouth became a signature element of Deadpool's character, representing his pain and suffering. It also served as a visual reminder of his dark past.
While the sewn mouth was a physical manifestation of Deadpool's past trauma, it also became a symbol of his resilience and humor. Deadpool's ability to remain witty and entertaining even with his mouth sewn shut demonstrated his unyielding spirit and ability to adapt to any situation.
The sewn mouth was eventually removed in later issues, but it remains a significant moment in Deadpool's history, showcasing the intensity of his past and his ability to overcome adversity.