Yeah, extra is a brand.. Since I'm unclear on what you're asking, I'll answer both. :)
Flavour: Mint! Brand: Don't really care, as long as it's gum. :\
Though actually, I preter polos. Gum gets on my nerves because it always loses its taste and あなた have always have to spit it out. Unless あなた 飲み込む it, and I don't fancy doing that again, I choked so badly last time I thought I was going to die! XD