Teeth have an outer surface covered in enamel, which as we all know is very hardy and durable. The short exposure to gastric acids won't cause any damage. Also inside the tooth (not to sure about fangs) is a substance call dentin, not as tough as enamel but stronger than bone.
I've also pondered on the fact how fangs pass through without puncturing stomachs/intestines?
As for fluoride, I wouldn't know if it would be benificial lol. But you can over dose on it (humans)so be careful.

John
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"Its no help to hide behind the statement that snake bite accidents are a rarity and that the average Dr seldom or never will treat one. For the bitten patient, it is a matter of life or death, and the rarity of the event is of no interest to him."

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