WASHINGTON — They are the ocean's most famous apex predator.

But something is eating at them - acid.

Rising acid levels in the world's seas will dissolve sharks' teeth - that's according to a new study.

Research suggests ocean pH will drop from 8.1 to 7.3 by 2300, making the water 10 times more acidic than today, according to the IPCC.

So to find out what that means for these fish, scientists collected teeth shed naturally by the sharks at this aquarium in Germany.

They placed them in water with the same pH level currently found in our oceans, and in water with the pH levels expected in 2300.

After eight weeks, they noted much more damage on the teeth placed in the higher acid solution.

"We discovered that oceanic acidification can damage shark teeth and we've known for many, many y

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