Good question I must say. I had wondered the same thing. The first couple days, you will probably cry and wonder what the heck you just did. You have a very hard time saying words and you just want to take them out and leave them in the plastic container. Well, DON"T! You WILL get used to them after about a week. I sat there for hours and taught myself how to talk again. I would repeat a word if I had trouble with it. I would read a book, and find out what words I had trouble with at first.
After a good 2 or 3 weeks, you will be thankful for them and your new smile. I see so many people walking around with no teeth in their mouth, but yet they have dentures. They said they didn't like the feeling they had in their mouth for the first week, and didn't go try it again. That was crazy. I would rather look better and take the time to get used to them.
After a good few weeks, you will be fine. They do take a while to get used to, like eating-that's the newest and hardest part. You have to be able to figure out how much glue to use..all this comes with time. You won't be able to eat like you used to as far as eating hard candy, steaks, apples, etc. But, for a pretty mouth and no pain anymore, it's worth it. Hope that helps..