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Are you talking about using cinnamon on toilet paper as a natural way to repel pests like cockroaches or for a different reason?
Cinnamon as a Pest Repellent
Cinnamon has a strong scent that many insects, including cockroaches and ants, dislike. If you sprinkle a bit of cinnamon on your toilet paper roll or around problem areas, it might help keep bugs away. Plus, your bathroom will smell great!