CM just stole my thunder.
I was just going to come back to breast milk. But, you know, finding some way to get it to have extra protein.
Other than that, I honestly don't know. I don't even remember how old they are by the time they stop mouthing everything. Oh wait--I do: 14.
Really, I don't know.
I have wondered about egg protein on surfaces--and dairy. There has been some work done to study how long peanut protein remains on nonporous surfaces (and not enough work IMHO), but I've not seen anything about egg or dairy, and I've wondered about it.
And I would also like to see the same research to determine how long it says in saliva, and under what circumstances it is broken down. Frankly for all top 8. That would be interesting and helpful.