You get it from the guy in Klassic Komics.
You either go to Big Nate Island and get the Bubblegum to get into Dentation on Poptropica or you get a membership on Poptropica
On Big Nate Island.
go to the store and it's a gold card. Theres all kinds of bubblegum. The free kind is just normal bubblegum but u can also get flaming bubblegum, snowing bubblegum, etc.
the man in the comix shop will give you it when you complete the puzzle
On big natt island? you get bubblegum and use it in school
you find it in the top left corner
It changes every time, but it's normally one of these: soccer, school, or bubblegum.
you have to get detention with the bubblegum and then use the stink bomb in detention.
You collect all the pieces of the comic strips, assemble them together, then return them to the man in the comic shop and as a reward, he will give you bubblegum.
Collect all the pieces of the comic, then talk to the guy inside the comic shop. He'll give you gum as a reward.
bubblegum
bubblegum