My first encounters with dentures took place in the early 60s, when both my parents started to put on full sets of gigi palsu**. It seems in those days, dental health was a problem among the folks, and sooner or later, fillings and extractions became necessary. And before long, many teeth would be lost.
For those who previously had bad-looking teeth, dentures also provided a set of beautifully fashioned upgrade, enabling them to smile with brimming confidence.
In any case, many if not most wearers would remove their dentures for cleaning before they retire to bed, leaving them in a glass of water.
I think these days, full dentures are a measure of last resort. With modern dental engineering techniques, most of the defects and wear-and-tear could be repaired without having to do extraction.
* Pun on the Malay song “Burung Kakak Tua”
** Malay word for “false teeth”