I used to teach elementary school kids (who are not as good at controlling their bladder) and never had an issue with them needing to go to the bathroom all the time. That could be because young kids tend to listen to "authority figures" more than older kids so when there was a bathroom break and they were told to try to go to the bathroom, that's what they would do. I suspect that older kids who aren't chaperoned to the bathroom for a break would rather spend their time socializing in the hallway instead of using the bathroom. I had a bathroom pass that hung on the wall which was actually a string tied to a big plastic key. There was only one. If it was hanging up then it meant nobody was using it and it was okay to take it and go to the bathroom. That way no 2 students were out of the room at the same time. Being as though the little kids didn't need to socialize in the hallways between classes, it really didn't get abused. If there was a kid who was going every single day then obviously it would've been addressed, but it just didn't happen. Typically, there's enough time between classes or lunch or "related arts" to go to the bathroom. If an older kid (or even elementary school kid) is having an issue with needing to go to the bathroom so much during class that it's a problem, then it's either a medical or behavior problem. I would tell my kid to try to use the bathroom between classes or whatever designated time they're supposed to go (whether they think they can or not). Only after they've REALLY done that and still had a problem would I question the teacher. I'd be more concerned about why my child was needing to use the bathroom so urgently every day. I know when I was a kid, there were times I'd wait until I was about to burst before I really felt like I needed to go. As I got older, I realized if I sat down and tried then I could actually go most of the time.