What is the KAI rule?

Brushing your teeth must first be learned and trained regularly. Parents play a major role in this: as role models and as a controlling authority, parents can create the conditions for healthy teeth for their children. It is important to always follow the same system and in the same order for dental care - the easiest way for children is the so-called KAI rule: chewing surfaces, outer surfaces, inner surfaces

How does it work?

  • Chewing surfaces: First, the child brushes on the chewing surfaces back and forth. It is best to start on the right side: first down, then up. Then comes the left side of it: first down, then up. Here, brushing is allowed, so that the deep grooves of the molars are clean.
  • External surfaces: The child "paints" with the brush circles on the outer surfaces of the closed rows of teeth: on the right side from the very back to the front and on the left side too. Then the incisors are cleaned as well.
  • Inner surfaces: Finally, all inner surfaces come down on top and bottom. It starts again at the very back and from red to white, that means from the gum to the tooth. The inner surfaces are "swept" with small circles or with rotary movements like a hand brush.

What else is important

Until the sixth year of age, a fluoridated child's toothpaste (maximum fluoride content 500 ppm) should be used. For brushing a pea-sized amount is enough. A fluoride-containing toothpaste for adults (fluoride content 1, 000 ppm - 1, 500 ppm) may only be used by the child at school age.


It takes a while for children to perfectly master brushing their teeth. Children up to the age of six are still no cleaning pros - until then, the parents are required. The parents must regularly check the plastering success and if necessary clean up. A task that may be annoying at times, but contributes significantly to the development of healthy children's teeth.

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