Took DD(2.8) to the dentist today and let slip that she is still breastfeeding. Dentist recommended that she stop, got the usual reasons:
-'Its sugary and rots the teeth'( DD has no decay at all)
-'Its best for 6 months but then becomes counterproductive because it damages teeth.'
-Oh and apparently I won't be able to cope when DC2 arrives in October. 
It did do some research into this when her teeth came through and was under the impression that breast milk is actually good for teeth and does not cause decay provided her teeth are brushed well before she feeds at night. Explained this to the dentist but she still said it would cause decay. I couldn't be arsed to get into a long discussion about it as I didn't remember the exact details of the research.
Just came home and had another trawl around the internets and and cannot find any current research that says breastfeeding causes tooth decay. Does it exist or is the dentist stuck on not very good research from the 70's?