Quantity in size of lentils, a soft children's toothbrush. 
Avoid ingestion. 
It is recommended to brush the child's teeth morning, afternoon and evening after your last meal. 

Helpful Information: This bottle is good to use for the duration of the feeding and not as a lullaby soother, because the food remains in the mouth concentrated levels of sugars and acids and can destroy the first baby teeth within a few months.