I recall a documentary from ~2014 about dental decay which was worse in the SE US, with teenagers talking about how much Mountain Dew etc. they drank. One said ~10 bottles/day as if that was a normal amount for anyone. And the interviewer noticed he had a 2-quart bottle and asked - THAT sized bottle??? Yes. So 20 quarts of sugary soft drinks a day. He was only ~14 and his teeth were all rotted down to little brown stubs. They must have been incredibly painful!