My pedodontist told me that in a small percentage of cases (perhaps 5%), breastfeeding during the night can cause tooth decay in babies. I was surprised to hear that, because I've read so much about the subject, and most babies with teeth can safely breastfeed at night and not develop decay. However, my pedodontist has seen tooth decay firsthand in the babies of very well-informed parents who did everything 'by the book'. She wanted to make sure that I knew that although the risk is low, my baby could be at risk (and there's no way to know if your child has the kind of teeth that will be at risk - until the damage is done). For this reason, she recommended I stop breastfeeding during sleep hours (when a baby's production of protective saliva is greatly reduced). I was reluctant to do that, however, because my baby won't drink cow's or goat's milk (and hates formula), and I produce much more milk at night than during the day. Given those circumstances, she recommended this product, and my baby LOVES the taste of both the apple and the grape. **BEFORE** I breastfeed her in the wee hours, I wipe out her mouth thoroughly with a Spiffie. The package doesn't say anything about this particular usage of the product, but I trust my pedodontist, who explained that by coating the teeth with zylitol (a wood sugar), you give the mouth's bacteria something to eat rather than the natural sugar in breastmilk. Somehow (the details of it escape me), this prevents the bacteria from attacking the baby's teeth. It's still not as safe as brushing the teeth, then not breastfeeding until daylight hours, but it helps mitigate the risk of decay. The only downside is that my baby chomps on my finger -hard!- sometimes. It helps if I use a finger on my other hand to prop her mouth open. Another bonus is that the Spiffies really do seem to placate her if she's teething. She'll really chomp down, suck hard on the Spiffie, and then relax and sleep better after being 'Spiffied'. Just be careful that you have a good hold on the Spiffie; my baby loves it so much she sucks really hard, and might swallow it if I'm not careful.