The explanation about et manducáte was very interesting. I received my First Holy Communion in May of 1959. During our preparation by the women religious of our parochial school we were taught to swallow the host intact, though one may let it soften, but not to chew, and avoid having it get stuck on the roof of the mouth. We would practice first with a piece of saltine cracker, then with unconsecrated hosts. My personal concern about myself chewing would be having particles of the Sacred Host getting stuck between my teeth (if I anticipate eating out, I dare not leave home without dental floss). One time I attended a Divine Liturgy at a Russian Byzantine Catholic Church (not Ruthenian). Those that received Holy Communion would afterwards go to a side table and consume a small "shot glass" of unconcentrated wine. I was told that this was a Russian custom. It may be a part of other cultural traditions but was told that one of the purposes was to "rinse the mouth" (for lack of a better expression) of the Blessed Sacrament so that it was fully consumed.