my daughter having issue of teeth decay & it starts with teeth discoloration after 1.5 yr it's not stop even I Stop breastfeed & brushing why this happens it is due to any deficiency or what??

A. dear mom. poor oral hygiene, offering excessive sugary and starchy food , fruit juices, low fluoride leads to tooth decay. keep good oral hygiene, avoid use of feeder, sipper cup, avoid feeding sweet foods.