Shark teeth deterioration/preservation

[Plantguy]

So I have these 2 incomplete shark teeth that I find really interesting and you might too as they almost look shredded/exploded. Finding perfect teeth is the goal but these hold my imagination and I only run across these kind once in awhile. So they are surface finds from Manatee Cnty, Florida. Miocene to Plio-Pleistocene in age? Neither has a root and the interior sections of the teeth are eroding and pieces of the enamel are still hanging on, especially the meg.  Do you think this sort of delaminating is suggestive of just poor preservation--can any particular taphonomy/history be inferred? I've seen a couple other threads about this subject but I throw it out there for these two examples. I havent found smaller tooth shark examples doing this but I suspect they are out there and may just be not as sturdy to survive.  I do have several completely small hollow examples but these seem different.  All comments/speculation welcomed on these 2 teeth. 

Thanks. Regards, Chris 

[Miocene_Mason]

I'm no paleoelasmobranchologist (as evidenced by made up term) but it looks kinda like a great white, which is Miocene to present.

[Al Dente]

I think they are deteriorating. Being close to the surface will allow the minerals to be leached out of the teeth. 

[ynot]

I have seen shark teeth that have complete enamel but no (or reduced) root structure. I have been told that they are unerupted teeth.

I do not see that in Your examples. I see an erosion type of damage, like Al Dente said.

[caldigger]

This type of condition is very common in the areas I collect shark teeth. In fact in a couple of spots, this is just about the only way you find the teeth and a whole one is the rarity.

[PaleoRon]

As mentioned, there are "hollow" teeth found which can be from unerupted/replacement teeth. Erosion can produce similar results as the enameloid is more resistant to erosion than the remainder of the tooth, making it the last to be dissolved. Teeth that are above the groundwater level can be eroded by weakly acidic rain water in much the same way that caves/caverns form in limestone. If there are mollusk shells in association with the teeth they will be attacked and eroded by acidic waters first, which spares the teeth. If there are no shells to act as a buffer the teeth are subject to erosion. The root tends to erode first as the blade is protected by the enameloid. 

[Plantguy]

Thanks guys for the feedback. Much appreciated. Regards, Chris