You think it should be rounder at the end? I am curious since I never noticed that their teeth were differently shaped until you pointed it out.
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yes totally. as we can see here the current model of the megalodon has teeth that are too sharp, which perfectly match the teeth of the great white shark :
but here, the model of the megalodon from the film The Meg (which is a very bad film, but at least the model of the megalodon is very beautiful, in particular the teeth which are very well represented) we see that the teeth are really different, more massive and rounder too.
It matches perfectly with the megalodon tooth in your photo: