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Medical experts answer your questions about allergies and sensitivities
Food allergens can be transferred through saliva. There are reports of allergic people experiencing symptoms after kissing. A study conducted a few years ago by Jennifer Maloney, MD, and colleagues backs this up. It showed that soon after eating peanut butter, salivary levels of peanut protein were high enough in some to cause a reaction. The same study found that some mouth-cleaning methods, like tooth brushing and using mouthwash, didnt completely get rid of the peanut allergen.