Is it safe to use the same spoon you stirred milk with to add more ovaltine mix to your glass of milk?

Ok, I know this has got to be a weird question, anyhow… My boyfriend was mixing a glass of ovaltine… he added some dry mix to his glass, added the milk, stirred, then used the SAME milky spoon to get more dry mix. I told him that ruined the dry mix, but he disagreed, saying that the milk would dry and be harmless. I think he was just being lazy, that he should get a new spoon instead of putting the milky one in the dry mix. I have kids, so I need some reliable information in order to rebuttal his claims (or the proof that it is indeed safe), and thus far have been unable to verify this either way. Help me out, smart Yahoo people.