If it's not in your mouth, it's not a fang.
Fair enough.. call it something else. Just needs to be anchored to a bone. Which orifice shouldn't matter.
Don't forget, some drugs are just as capable of killing someone as a toxin. You could even create a custom drug from Chrome Flesh that reduces a stat to a point where they go into a coma.
Name:
Street Name:
Cost: 225¥
Availability: 11R
Vector: Injection, Ingestion
Addiction Type: Both
....Rating: 6 (5 weeks)
....Threshold: 2
Speed: 3 combat turns
Duration: 10 x 1D6 min
Effect: +2 Body, +4 Logic, +1 Intuition, -4 Charisma, Pain Resistance 3
Crash: 2S Damage (unresistable)
Formula: Tank (F), Razor Mind (2), Einstein (2), Ingestion Enhancer