So should you, a parent, go sucking on your baby's pacifier in order to give them a healthier life? No one's really sure yet. It can't hurt, assuming you're not currently sick. And it's probably safe to let your little one enjoy a pacifier that hasn't been thoroughly sanitized, as long as it hasn't fallen somewhere overtly gross. But allergists aren't yet promoting saliva as the best cleaning agent. Right now their best advice for avoiding allergies is to breastfeed if possible, introduce babies to potentially allergenic foods early on, and not to smoke around your child. Bonus: get a pet, since they help expose babies to potential environmental allergens, thus hopefully preventing an allergy from forming in the first place. If you want to also use your saliva to clean off your baby's pacifier, the evidence suggests it isn't a bad idea and might even be a good one. But if the thought appalls you, don't stress: you're probably not dooming your child to a life of sniffles and food allergies by withholding your spit. There are other ways to ensure your kids spend their formative days surrounded by a robust variety of microbes.