Good teeth, bad teeth. If you’re upping your flow to compensate for under-extrusion, it may be that your extruder ain’t exttroodin.
Will the filament actually eat away at the teeth over time?
Any good alternatives?
Having a spare on hand. 
This is a realllly old sonic screwdriver lol
When hobbing the bolt, use cutting oil. Make sure nothing is stuck in the teeth of the tap.
Greetings to you from Iraq
I found also that with abs if clamping teh tension roller too hard without filament moving through the extruder can cause the teeth to fold over. Only a heat treated bolt would prevent this.