What's unrealistic about not letting your kids buy IAP? You set parental control and tell them they are not allowed to buy IAP and that's it. You also have to

What's unrealistic about not letting your kids buy IAP? You set parental control and tell them they are not allowed to buy IAP and that's it. You also have to teach kids to brush their teeth every night. That's 365 times a year. Is that unrealistic to teach them, too? Or is teaching them to brush their teeth an instant process?