They all provide ‘oral regulation’!!
‘Oral regulation’ means any repetitive chewing/sucking which calms the central nervous system and also improves concentration.  From babies with a dummy/thumb sucking, to kids and adults who suck lollipops, chew gum (think cricketers), chew fingernails and even cigarette smoking.
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Besides the nutritional benefit, these ‘crunchy things’ provide wonderful oral regulation.  I guess you could call them healthy oral regulation?  And it certainly works with Master nearly4!
Do you or your child use any other items for oral regulation? 🙂 Heidi