sharp teeth

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I personally wouldn't because of whatever chemicals they've used on that alligator head could be harmful to your snake, especially in the water.

I agree with this. I am not an expert on skeletal preservation by any means but I'm pretty sure most preservation includes peroxide or bleach. Both are not good to have in the snakes drinking water. As for sharpness, I wouldn't be comfortable with the teeth being in the enclosure - but I don't have an answer for you based on experience for that aspect.

Wish I could be more help,

Cheers.