I dont think this is a tooth. It looks somewhat like an epiphysis, the joint surfaces of long bones which are unfused in younger animals. However, the small size of the photographs makes it difficult to see clearly.
The pictures are small and it is not easy to tell but it looks like the distal end of a radius of a hoofed mammal. When butchering an animal for meat the radius is often sawn through and the 'hand' disposed of leaving the 'joint' for sale in a butchers. When the hand then decays the end of the radius becomes separated.