The doctor ground his teeth in anger because the child's mother was using the word nice, for the doctor. She also said that he would not hurt her.
According to the Nemours Foundation, an estimated 2 to 3 out of every 10 children will grind or clench their teeth. Teeth grinding most commonly happens while your toddler sleeps, but you may notice them doing it during the daytime as well.
Dentists don’t always know the reasons a toddler will grind their teeth. Some of the reasons can include the following.
Your toddler’s teeth aren’t aligned properly.
Your toddler uses it as a way to relieve pain, such as from an aching ear or discomfort from teething.
The result of certain medical conditions, such as cerebral palsy, or medications taken.
In older children, teeth grinding can be a sign of stress or anxiety. An example could be stress related to a change in routine or feeling ill. Sometimes you or your doctor may not be able to pinpoint the exact cause.