MB3 152b: Perfume and Mouthwash on Shabbos (322:4-5)
Cutting a pill on Shabbos, using a match as a toothpick. Breaking apart pieces of aromatic wood on Shabbos so they emit their scent for a sick person. Using aromatic oil and mouthwash on Shabbos. Cutting items on Shabbos for a constructive purpose is prohibited. Does the melacha of cutting apply to food?