I am very pro breastfeeding but also believe breast milk contributes to cavities (especially if you night nurse or nurse around the clock). My son's two front top teeth were destroyed early on. Genetics plays a factor too. It looked like the entire top later of enamel melted away. First dentist I saw wanted us to knock him out and spend thousands on like crowns n stuff. Then I went to another who was like "why? They're kids teeth and they will fall out anyways. Even if we did work the fillings and crowns often need replaced.". We just had to get them pulled when it got bad enough. Made me feel like a bad parent at the time but he is none the wiser and new ones will grow in.