This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to avoid getting braces
Prevent mouth breathing.
If your child breathes through his mouth frequently, this may lead to misalignment of his teeth that will eventually need correcting with braces. Take measures to make sure mouth breathing does not occur with frequency.

OPT: [+] You can place dividers in the locations where your child breathes in his mouth. You can also put fabric under a child's baby's teeth to prevent them from getting jostled.. [+] Do not shout loudly at your child or use gestures or body language that might let the child see that you are unhappy with him or her. Continue to speak to your child calmly, showing calm acceptance and understanding, and turn off lights and music as much as possible.. [+] Ideally, the tongue should rest just inside the upper teeth. When a child breathes through his mouth, his tongue is pushed down and outside pressures are exerted on the teeth.. [+] Hold your mouth closed for a few seconds when your child breathes out. Say " what a good boy! " once you're finished breathing..
The answer is:
Ideally, the tongue should rest just inside the upper teeth. When a child breathes through his mouth, his tongue is pushed down and outside pressures are exerted on the teeth.