when you chew on the straw since there's not that much to shew you're pretty much grinding your teeth together which is totally bad for you. Don't do it. especially not for 2 hours.
Chewing a on a straw is really bad for you, the straw might mess up or teeth and worse of all you can swallow it and swallowing a straw could result in alot of complicated medical problem so do no not chew on a straw its bad for your health and its kinda childish I hope this help.
its only bad for u if u accidently choke on it or poe someones eye out so dont forget to take it out of ur mouth if ur gonna kiss some1 but other than that nope its not bad for u