Teeth grinding is an involuntary tightening of the jaw that mostly occurs during sleep. A significant proportion of preschool children go through a period of it, and most cases resolve on their own. Even so, it should be assessed if there is wear on the teeth or jaw pain.

Why it happens

There is no single cause. Frequently reported factors:

  • Changes in how the jaws meet during the transition from baby teeth to permanent teeth
  • A mismatch in the bite
  • Tension during the day, a change in routine, starting school
  • Mouth breathing due to adenoids and a blocked nose
  • Irregular sleep

When to see a dentist

  • Noticeable wear or chipping on the tooth surfaces
  • Jaw pain, headache or pain around the ear in the mornings
  • A sound or difficulty when opening the mouth
  • Grinding that continues during the day as well

What to watch out for at home

Keeping the hour before bedtime calm, reducing screen time and a regular sleep schedule are commonly given suggestions. Heavy meals and sugary drinks before sleep are avoided. If there is nasal congestion, its cause is investigated.

Telling the child not to clench does not work, because it is a behaviour that happens during sleep.

Is a protective guard needed

That decision belongs to the dentist. During the baby-tooth period it is usually not needed; if there is wear on the permanent teeth, a night guard may come up for consideration.