I have a 4 year old son. He stops using his milk bottle when his dentist told him na "no more milk in bottle, sa baso na lang para d na masira teeth mo lalo". He follows his dentist. But my problem is, he doens't like to drink his milk in glass. Any tips or other products that you can share how to have the needed calcium etc the milks have?

You can give him a straw. Ganon yung tactic ko sa daughter ko. Paminsan ang arte uminom from the glass. She's also 4 years old. So bumili ako ng mga straws in different colors and got her a plastic cup with Disney Princess print on it. That worked. Other sources of calcium are dairy products like cheese and yogurt. Painumin mo rin ng yogurt drink.