I realize this post was written two years ago, but I am in a similar situation. My 14 month old just had her first dental check-up and we were told the enamel on the back of her front 4 teeth is thinning. The dentist attributed this to night nursing. She suggested I wipe the teeth with a wet cloth after every feeding. This, of course, would defeat the purpose of night nursing - putting my daughter back to sleep! The research I've come across downplays the role of breast milk in the formation of cavities, but I am feeling guilty that I may be playing a role in the decline of my daughter's teeth! She eats healthy, unprocessed food, she drinks water with her food, she doesn't use a bottle, and we brush and floss regularly, so I am tempted to think feeding during naps and at night might be the culprit. Any thought?