Dental "grills" hard on the teeth and gums - Yahoo! News
http://news.yahoo.com/s/nm/20060712/hl_nm/dental_grills_dc
"Dental grills may bring a lot of "bling" to a smile, but wearing these devices can cause lasting damage"
StateMaster - Statistics Oral health Loss of natural teeth by state
http://www.statemaster.com/graph/hea_ora_hea_los_of_nat_tee-health-oral-loss-natural-teeth
"DEFINITION: Adults aged 65+ who have had all their natural teeth extracted."