I will ask to see the dentist when I return and tell him that if the permanent denture is not going to be formed with any more care than this, I want the remainder of my money back and I will go elsewhere. Even for an "affordable denture" the quality of this temporary is not worth the mouth pain and I will never be able to wear it for 6mo to 1yr while I wait for the permanent one. If you can afford better, then please do, as you will not be happy with the poor quality results.
When dentures no longer fit well, the correct action is to seek follow-up care. Denture adhesive is recommended for dentures, even well fitting ones. Adhesives improve retention, seal the borders to prevent food from slipping under, and cusion the soft tissues from the rigid acrylic. Using denture adhesive may improve the fit, but it tends to work best when only a small amount is used. Covering the entire denture fitting surface in adhesive makes it stay in less well. Adhesives may compensate for gradual loosening of a denture, but it is only a temporary solution; it does not solve the problem. Fortunately, dentures can often be relined with relining materials to improve the fit, and this process costs less than creation of new dentures. Overall, a well-made denture could last about 5 years (or more), but this is different for every patient.