I had 3 teeth that were in the front of my mouth extracted and got an immediate denture. I got a partial for the bottom. My gums hurt and I have sore spots. My gum between my two big teeth is swollen but I had to keep the dentures in. The bottom partial keeps popping up or moving. What can I do to make the bottom fit better? Should I use a "liner"? It is very difficult eating with the dentures. Is that normal?

There definitely is an adjustment period to get used to dentures. You definitely should go back to the dentist and have them adjusted so they feel comfortable. This is to be expected and is generally included in the price of the making of the denture. When were the teeth removed?