One model guesses that after prey is taken down with a saber-tooth's claws, it rips open the abdomen to cause massive blood loss and death. Perhaps a group of saber-tooths would take down a wooly mammoth (or other megafauna) and then wait for it to bleed out before feeding. Another good hypothesis is that once prey is already held still after being taken down, a solid bite to the throat would quickly take out the windpipe and arteries in many mammals.
https://www.reddit.com/r/askscience/comments/1kqgcz/how_did_saber_tooth_tigers_bite_things/
The bite force of saber-toothed tigers was about 100 kg. For comparison, the lion’s bite force is 250 kg/cm2, and human bite force is 73 kg/cm2. However, smilodons’ jaw gape could reach 120 degrees, and in some species even 130 degrees, while modern-day lions’ gape is only 65 degrees.
http://dinoanimals.com/animals/the-saber-toothed-tiger-smilodon/
Extinction. 1  The first one is about their incapability of hunting smaller and faster animals. Therefore, when larger species started to go extinct, the saber-toothed tiger perished too. 2  The second hypothesis is associated with climate changes that might have led to the extinction of mammoths and giant deer.
http://dinoanimals.com/animals/the-saber-toothed-tiger-smilodon/
And like the summery says the precise functional advantage of the saber-toothed cat's bite, particularly in relation to prey size, is a mystery FWIW, some walrus have been known to kill and eat seals tho.
https://www.reddit.com/r/askscience/comments/1kqgcz/how_did_saber_tooth_tigers_bite_things/
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https://www.reddit.com/r/askscience/comments/1kqgcz/how_did_saber_tooth_tigers_bite_things/
Smilodon populator was the largest of saber-toothed tigers. 1  Weight: 220-400 kg. 2  Height at shoulders: to 1.2 m. 3  Length: to 2.6 m (without the tail) 4  Tail length: 30 cm. 5  Length of canines: 30 cm – they jutted from the upper jaw at 17 cm. 6  Occurrence: 1 m – 10,000 years ago.
http://dinoanimals.com/animals/the-saber-toothed-tiger-smilodon/
The skeleton of saber-toothed tiger (Smilodon). The saber-toothed tiger – interesting facts. The saber-toothed tiger was in fact a big cat, not a tiger. Although the smilodon had 30-cm-long canines, its bite force was slightly stronger than human’s. Smilodons have often appeared in pop culture. Saber-toothed tigers’ canines were highly prone to fractures because of their oval cross-section.
http://dinoanimals.com/animals/the-saber-toothed-tiger-smilodon/
Extinction. 1  The saber-toothed tiger was in fact a big cat, not a tiger. 2  Although the smilodon had 30-cm-long canines, its bite force was slightly stronger than human’s. 3  Smilodons have often appeared in pop culture. 4  Saber-toothed tigers’ canines were highly prone to fractures because of their oval cross-section.
http://dinoanimals.com/animals/the-saber-toothed-tiger-smilodon/
Although the saber-toothed tiger had large 30-cm-long canines, its bite force was slightly higher than human’s… Damaged bones as a prove of gregariousness The analysis of saber-toothed tigers’ bones also proves that they lived in groups.
http://dinoanimals.com/animals/the-saber-toothed-tiger-smilodon/
Tallies the saber-toothed cats to work the head or neck of their prey like a lumberjack/logger's can't hook. Once the head or neck was maneuvered into position, the cat then could bite down and separate neck vertebrae or bite so as to piece the skull--depending upon the kind of prey they were attacking.
https://www.quora.com/Were-the-sabertooth-cats-saber-teeth-too-long-for-its-jaws
what is the bite force of a saber tooth tiger
The bite force of a saber-toothed tiger is about 100 kilograms.  The bite force of a saber-toothed tiger is about 100 kg.