Cosmetic Benefits: The cosmetic benefits of dentures are obvious. They fill in gaps left by missing teeth so patients feel more confident about their appearance. Dentures can replace missing teeth or teeth that were in poor condition, prevent further shifting of remaining teeth, support facial structure and integrity, and increase patients' self confidence.
Generally speaking partial dentures tend to be held in place by the presence of the remaining natural teeth and complete dentures tend to rely on muscular co-ordination and limited suction to stay in place. The maxilla very commonly has more favorable denture bearing anatomy as the ridge tends to be well formed and there is a larger area on the palate for suction to retain the denture. Conversely, the mandible tends to make lower dentures much less retentive due to the displacing presence of the tongue and the higher rate of resorption, frequently leading to significantly resorbed lower ridges. Disto-lingual regions tend to offer retention even in highly resorbed mandibles, and extension of the flange into these regions tends to produce a more retentive lower denture. An implant supported lower denture is another option for improving retention.
There are some other kinds of full and partial dentures that differ from traditional permanent dentures including a type called immediate dentures. These dentures are created before the teeth that are being replaced with dentures have been removed and are used immediately after tooth extraction and during the healing process, which can be up to six months long. These dentures can be more easily refitted than permanent dentures to accommodate for mouth changes as the swelling in the gums and jaw subsides while healing. The immediate dentures will be disposed of once the healing process is complete and your mouth is ready for permanent dentures.
Remember: You can do serious harm to your denture and to your health by trying to adjust or repair your denture. Using a do-it-yourself kit can damage the appliance beyond repair. Glues sold over-the-counter often contain harmful chemicals and should not be used on a denture. If your denture breaks, cracks or chips, or if one of the teeth becomes loose, call your dentist immediately. In many cases, dentists can make necessary adjustments or repairs, often on the same day. Complicated repairs may require that the denture be sent to a special dental laboratory. 
George Washington (1732–1799) suffered from problems with his teeth throughout his life, and historians have tracked his experiences in great detail.[14] He lost his first adult tooth when he was twenty-two and had only one left by the time he became president.[15] John Adams says he lost them because he used them to crack Brazil nuts but modern historians suggest the mercury oxide, which he was given to treat illnesses such as smallpox and malaria, probably contributed to the loss. He had several sets of false teeth made, four of them by a dentist named John Greenwood. None of the sets, contrary to popular belief, was made from wood or contained any wood.[16] The set made when he became president was carved from hippopotamus and elephant ivory, held together with gold springs.[17] Prior to these, he had a set made with real human teeth,[18] likely ones he purchased from "several unnamed Negroes, presumably Mount Vernon slaves" in 1784.[19] Washington's dental problems left him in constant pain, for which he took laudanum.[20] This distress may be apparent in many of the portraits painted while he was still in office,[20] including the one still used on the $1 bill.[21][a]

Teeth can fall out for a number of reasons, ranging from genetics to drug abuse. Most commonly, teeth are removed or fall out on their own due to severe tooth decay. Neglect to upkeep oral hygiene or not seeking proper treatment for damaged teeth, can lead to the onset of decay which in turn leads to loss of teeth. Visiting you dentist in 6 month intervals is a good preventive measure to spot any early signs of decay. 
Dentures Reviews