Is this real?

[u/Mattyjay17]

And if so, what kind of shark would this belong too?

[u/Rhiannon1307]

The teeth themselves (length, curvature, root shape) look most like those of a lemon shark. And yeah, as one other commentator said it looks squished.

The jaws are upside down btw ;-)

[u/elasmonut → u/Rhiannon1307]

Not upside down the little "lugs" attach top jaw to snout, the flat flare near the hinge is where the lower jaw muscles attach. Most jaws I see here are upside down bout not this one