My toothbrush paste tastes like cinnamon. Technically I have two different ones, one with fluoride, and another with nano-hydroxyapatite, since both compounds are good for tooth care, so I just mix the two together, and the hydroxyapatite one is 'cinna mint' flavor, from a Japanese company (BOKA).
Also, this is technically an extra, so it's up in the air if it's actually canon, I think, but it seems like it would totally be an exchange they might have at this stage, so, seems at least canon-adjacent.
Also, I come from the anime, so I already know this is legit a romance story. These two goobers are just so cute.