well? i take care of my teeth and all, but is it a sure thing that when i get old i’ll have to get dentures? i’ve never heard for sure, and all the old people i’ve me (well, 70+) have had them. but maybe they didn’t take good care of their teeth?
Ummmm. Nope. My grandmother had her own teeth until she died 2 years ago at age 86(i think-she was born sometime in the 10’s). As a matter of fact, she had braces on her teeth for about a year 3 years before she died. It was kind of cool to see grandma with braces. 
Even if you lose all your teeth, a mixture of dental implants and permanent bridges will ensure that you never have to take your teeth out every night. If you have the money, and can stand the procedures.