2. True, but a sacrament is supposed to be a *visible *sign of inward grace. Thus, if the Host is not recognizably bread, and especially broken down to molecular level, then I don’t think Christ is present. To take another example, let’s think of the Sacrament of Baptism. In the air, there are some water molecules, especially if it’s a very humid area such as where I’m living. Would it be a true baptism, then, if I were to just fan some air over a person’s head saying the formula for baptism? Of course not! To paraphrase St. Cyprian, I would just be getting them cool. The same also applies to the sacramental presence of Our Lord in the eucharistic host. So, I would not worry about the tiny particles we cannot see. Nevertheless, it is extremely important to exercise care in distributing the Eucharist and disposing of any particles in a respectful manner.