Gintama: Season 4, Episode 25

4 - 25: No Matter How Old You Get, You Still Hate the Dentist

Gintoki’s mouth is swollen like crazy, forcing him to go to the dentist for treatment. Unable to cope with the stress and pressure of waiting, a crazed Gintoki screams for someone to just kill him and be done with it. After getting scolded by the staff, Gintoki waits for his turn when another man with a swollen mouth comes in, making things even more complicated!