There used to be a staggering variety of saber-toothed cat species from all over the globe, the most well-known (and largest) of which was the Smilodon of North and South America. These were also the last surviving saber toothed cats, and they died out about 10,000 years ago. They probably died out because many of the large prey animals that they depended on, such as mammoths and ground sloths, became extinct. The reasons that their prey died out are still under debate, and possible theories include climate change, disease spread by humans, or overhunting by humans.
Sabre-toothed tigers are believed by mainstream scientists to have become extinct mainly because their climate was ever changing. They lived in the Ice Age, and they supposedly disappeared shortly after because of the sudden temperature increase. Man also lived in the same habitat as the tiger's and he hunted the Sabre-Toothed tigers prey, meaning that they had limited supplies of food. This meant that the food chain of the Sabre-toothed tiger was damaged, and meant that very few of them could survive. Yet, this theory does not stand up to scientific scrutiny and it's not very likely either that this is what happened.
The most debated and most ridiculous answer is that the long teeth that the tiger's had were almost too long, meaning that they couldn't bite their prey's neck, without fear of breaking their canines. Instead, they had to gouge the bellies of the animals which was a lot more dangerous and risky, so these dangers stopped them from hunting, so they didn't survive. The most probable answer then is that Saber-toothed cats survived til modern day and might still be alive in Europe, Africa, and North- and South America. And this is investigated by cryptozoologists who have collected a series of eyewitness reports. However, there is also still a Saber-tooth relative alive today: the Clouded Leopard. Scientists are not sure, at this time, why the saber toothed tigers died out roughly 10,000 to 12,000 years ago. The prevailing belief is that climate change and the loss of the bigger prey animals at the end of the ice age rang the death knell of the saber toothed tigers.Saber toothed cats have been extinct for about 10,000 years. Nobody is sure why they died out, but they probably died out because most of the large animals that they hunted and relied on died out. Why these animals became extinct is still in debate.nobdy knows, like the dinos. :(