Fossil tooth, bone or just natural rock???

As mentioned in another post I was given an old small collection of beach cliff fossils from east coast Canada. A majority of the fossils are very easy to make out. But there are a bunch of them that I donā€™t know are a thing or not. This one I was curious about because it has the shape and crease of a tooth but could be just coincidence. Any help would be appreciated. Thank you! šŸ˜
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