A Denture is an artificial replacement for one or more missing teeth and adjacent gum tissues. A complete denture replaces all the teeth of the upper or lower jaw. Partial dentures are commonly used to replace a single tooth or two or more adjacent teeth. The partial appliance may be removable or fixed; it usually relies on remaining teeth for stability.
Improved stability is sometimes needed for some denture wearers who have less gum structure, in this case a few remaining natural teeth are kept to hook a partial denture on to. If all teeth are missing than dentures are made to the form of your natural gums. A new denture can be very restricting at first but the longer you have them in your mouth the better they begin to feel.
Wearing a new denture takes practice, like taking small bites at first, leaning to talk correctly, you don't have as much room in your mouth like before. Don't worry you will adapt to your new denture sooner than later, you will also experience sore spots in your mouth from your new dentures. You should immediately consult the person who made them for you and have the sore denture spots removed from your denture.
Later on you might notice that your denture is getting loose and irritating to you. This is due to loosing weight or gum shrinkage from your hard plastic dentures. It also could be from getting your denture made to soon before your gums were done shrinking.
Dentures are constructed to fit your gums at the time of fitting if you get them to soon your gums could still shrink enough to make your dentures to become loose. In that case you would need a denture reline, a denture reline is when a denture material is added to your denture and placed into your mouth to take up the space between your denture and gums to get a secure fit.
The biggest factor of all when getting use to a new denture is TIME.