When I went to Costa Rica for some surgery, 3 yrs ago, I stayed in a surgery resort where only people having surgery stay...
there were 3 young women there. One was 32, one was 34 and the other one was 38. All of them were having all (yes all) their teeth pulled and having all new teeth put in...
one said it was bad genes, the other two admitted to eating a lot of 7/11 food and lots and lots of soda and slurpees..

I am going to say it's definitely the processed food and sugar that has been popular since the late 70's through the 90's...
lots of fast food, cereal, sodas, slurpees.... yep..

Is sugar as bad for kids? I saw proof.. Imagine having all of your teeth pulled to have new teeth implanted....