9 days ago i had my top teeth extracted & im wearing dentures. with my dentures out, i apply suction to the roof of my mouth & it ballons out. ?

Hard Palate: The tissue on the hard palate is tightly bound to the underlying bone and shouldn't move. It's possible the tissue is still healing and is a little movable. To help promote faster healing, stop applying suction.

See below: It sounds like you had an immediate denture fabricated. Speak to your dentist about an implant supported denture for more stability. An implant supported denture usually does not have a palate and could be more comfortable.