What are the convenient snacks or cakes in Shanghai?

Shanghai's specialties include white rabbit toffee, bitter and sweet, tons of dried duck in Daoxiang Village, Mo Lifeng beef jerky, fresh meat moon cake in Laodafang, smoked fish, duck head, marinated eggs, ribs rice cake, crab shell yellow, Gao Qiao muffin, Chenghuangmiao pear juice and creamy spiced beans.

But some people with bad teeth can't eat it.