“the calcium and phosphorus content was lower in the jaw bone than in the teeth, especially at the juvenile stage. This could explain the broken jaw bones during fights between animals, as the bone is much weaker than the junctional tooth–bone areas.”…
https://pmc.ncbi.nlm.nih.gov/articles/PMC4974546/
https://pmc.ncbi.nlm.nih.gov/articles/PMC4974546/