My friend won't stop biting food and giving it to my toddlers

Whenever my friend is around and there's food, she offers to share with my kids, but it's bites from her mouth rather than cut up. It's driving me crazy! I've spoken to her gently about how flu season is coming up and dont spread germs, but the next time she did it again because she didn't feel sickly.I feel like I'm failing them and their future teeth by not having a bigger backbone, but she's so nice I just don't know how to tell her to stop. via /r/Parenting https://ift.tt/2xlPhrg