Basically all grasses contain silica phytoliths but they likely don’t significantly contribute to teeth wear. https://www.sciencedirect.com/science/article/abs/pii/S0305440306001245

Reverse threads on gas cylinders are (as far as I know) only used for flammables.

Not much to go on, get evaluated by a psychiatrist and then work on getting either or both medicines or therapy to help you manage it.

Unless you have something more specific that you can say about why you think that you have ADHD or if there’s something you need help with, that’s about as far anyone can tell you.

Some Ford cars already have camera systems that can recognize speed limit signs and limit cruise control speeds. They could just use that instead of developing something that fines and jails people