A Answers (2)
To stop nighttime teeth grinding (night bruxism) in a child, you need to know the underlying cause. Some children grind their teeth at night because their teeth and jaws are developing. In younger children, teeth grinding may be caused by pain from teething. It can sometimes mean the child is having pain from an ear infection. Teeth grinding in children can also be a sign of stress, anxiety, or feeling angry or frustrated. Many children outgrow night bruxism without needing treatment. If your child grinds his teeth from stress, worry, or anger, talking to him about his concerns may help. You can also try a relaxing bedtime routine.
American Dental Association answered
The causes of bruxism are not known but many believe that stress, sleep disorders and an abnormal bite all play a role. If you suspect your child is grinding his teeth at night or have heard evidence indicating that he is grinding, schedule an appointment with his dentist right away.
Bruxism treatment depends on each individual’s situation. Your child's dentist may recommend stress reduction, or that he wear a protective night guard over his teeth while he sleeps.