Gaps left by missing teeth can cause problems with eating and speech, and teeth either side of the gap may grow into the space at an angle. Sometimes all the teeth need to be removed and replaced. So you many need a complete set of dentures or partial dentures, which replace just one or a few teeth.
There is a always a period of settling in with new dentures. Initially, you may be advised to wear them for most of the time, including while you are asleep. Then once your mouth has adjusted to to your dentures you may be able to take them out before going to bed. You can store them in a small amount of water to stop them warping.
If your dentures are well looked after they should last several years.
However, your dentures will need to be relined or re-made because of
normal wear or a change in the shape of your mouth. Bone and gum ridges
can shrink, causing your jaws to meet differently. Loose dentures can
cause health problems, including sores and infections, not to mention
discomfort. A loose or badly fitting denture can also make eating and
talking more difficult, so worn or badly fitting dentures should be
replaced before they cause problems.