Apart from elephants the tusks of Walruses can also get quite large being up to 1m long and weighing 5.4kg or 12lb. The canines of hippopotamuses can also be quite impressive. Tusks aside it is the African Elephant again who comes in as the winner in the largest teeth stakes. An bull African Elephants molars can be easily be more than a foot long and weigh 4kg or 10lb. The number of teeth in an animals jaw depend on its life history.
Teeth are expensive to grow so no animal wants more than it needs.
Most placental mammals are happy with between 20 and 40, while most marsupials have 30 to 50. As a general rule animals that feed on insects have more teeth than either herbivores or the larger carnivores. There are some funny exceptions though. Several groups of mammals have decided to do without teeth altogether. The 10 species of Whales in the order Mysticeti, the 8 species of Pangolins family Manidae, and the 3 species of Anteaters in the family Myrmecophagidae and order Edentata have all given up on teeth completely and have none.