Aspects of this topic are discussed in the following places at Britannica.
A rattlesnake fang is similar to a curved hypodermic needle. At the top it meets with the end of the venom duct. Soft tissue surrounds the end of the venom duct and the base of the fang, providing a seal against leakage. Large venom glands at the base of the jaws are responsible for the distinctly triangular shape of the head. Fangs are periodically lost owing to wear and breakage. Each fang...
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