Cinnamon contains some tannic acid as also is in the skin of certain fruits (pears, strawberries e.g.) or fruit juices, which has a negative effect upon mucuous membranes. But this effect is of short duration. Some liquids or pastes used by the dentists have a similar effect. But must not think, it has a negative effect upon ones embouchure as there would be a certain time period between eating or drinking using such substances and playing the horn. If one keeps that in mind, he or she would not intake such during intermissions or just before a concert.
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