Fluoride free toothpastes which are sensitive for children's teeth are available in market.. and in various flavours!!

I dnt suggest it.. you better use some ayurvedic like danta kanthi or paste that are prepared for kids ... I believe you will find great answers to this question in questy. in a search engine for Indi

try kidodent tooth paste or pediflor toothpaste spcly for kids..