The city Asenovgrad in south Bulgaria was
selected as the test community and the nearby city of
Panaguriche as the control community; later, Karlovo
became the control community. The fluoridated milk
was produced and transferred from the Plovdiv dairy,
in plastic bags, containing 1 mg fluoride per day.
About 3,000 children aged 3 to 10 years entered the
program in Asenovgrad (Figure 2).