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Jason Derulo is losing teeth and adding stacks of cash thanks to TikTok ... and he says you don't have to be a famous singer or mess up your grill to start raking in the dough.

The "Cats" star and "Swalla" singer tells TMZ ... anybody can make a killing off the video creation app, as long as you create your own space and find a niche.

Jason's certainly found his TikTok calling ... and we're not just talking viral music trends.