A team of 13 vets, dentists and keepers were drafted in to perform root-canal work on a tiger's massive gnashes.
The 30-stone Siberian tiger was knocked out for four-and-a-half hours to remove one of his giant fangs and perform root-canal treatment.
In an extraordinary set of pictures, animal dentists, vets and zoo-keepers can all be seen working on the ten-year-old tiger named Kuzma, who lives at Knowsley Safari in Prescot, Merseyside.
Kuzma required treatment after an examination found he had a broken a root in one of his hour inch long canines, which then had to be completely removed.
Despite his now gappy grin, the park hope he will breed with female tigers to help increase the population of the endangered wildcat species.
Bubble wrap, mittens and a duvet were used to keep the creature's temperature up throughout the lengthy procedure.
Two specialist veterinary dentists, a veterinary anaesthetist, dental nurse, radiographer and eight experienced carnivore keepers came together to perform the surgery.
Vet Jen Quayle said: "We're regularly checking on Kuzma's health and welfare and a routine examination revealed the need for treatment on his teeth.
"The procedure involved a lot of preparation. The anaesthetic keeps Kuzma comfortable and meant the treatment could be carried out safely."
She added: "Tiger's teeth are a bit like icebergs. The tooth that you see above the gum is just part of the story.
"The canine tooth's root runs much deeper into the gum and in a tiger, as much as two thirds of the tooth is hidden inside the jawbone.