Hello ,
Nothing to worry much !!about your child, he is suffering from rampant caries which is a type of early childhood caries, caused often due to poor diet, poor oral hygiene, or majorly due to nursing habits previously!!
Next Steps
Get your child examined by a specialist
Health Tips
immediately stop your child consuming too much of sugary,sticky food(eg:no chocolates,no toffee,no sugary juice/milk) n till you see a specialist start with good oral hygiene practice!! N include healthy nutritious food in his diet.