San Jose’s added it. Albuquerque added it. Fresno removed it after having it. Tucson and Wichita does not - but Tucson’s level is about 50% of the recommended level.

By comparison Portland’s is 3%. Probably why dentists see high level of tooth decay here.

Looks like San Jose got it in the late 2010s (2017/2019 timeframe). There are lots of people on HN from that area - hopefully someone can comment on the general state of children / people's teeth prior to then.