She took the younger to the hygienist.
She began to talk about the importance of brushing teeth in the morning and evening.
Especially in the evening, because the teeth are left with pieces of food and the microbes eat them. And if the teeth are cleaned, the microbes will remain hungry.

Here is finally the cause of the night-burnout, when you suddenly realize yourself at three o’clock after midnight, in cowards, in front of an open refrigerator, with a cape of borscht.
It’s not me, it’s the microbes that have forced me!
They were hungry!

by Marinalevy