From LLLI's 1995 "Facts about Breastfeeding":

This appears to be the first unequivocal evidence that caffeine is a
cariogenic agent when newborns are exposed to it during critical periods
of tooth development; the widespread human consumption of caffeine could
be a threat to the healthy development of teeth.

Nakamoto, T. et al.  Cariogenic effect of caffeine intake during lactation
on first molars of newborn rats.  Archs Oral Biol 1993; 38(10):919-22.

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Agnes Vargha ac748 @ freenet.carleton.ca