There are a number of sources of fluoride, these include:

Water
In Australia fluoride occurs naturally within water supplies, at a concentration of approximately 0.1 mg/L. However, this number varies amongst different populations, as specific fluoridated communities exceed this amount, ranging from 0.6 to 1.0 mg/L of fluoride present. The process of incorporating more fluoride into water systems is an affordable mechanism that can provide many beneficial effects in the long term. Dentrifices
Fluoride toothpaste came into production in the 1890s, after its benefits were investigated. This product has become available to most industrialised countries, and within Australia accounts for "90% of total toothpaste purchased". Fluoride supplements
Fluoride supplements were first recognised and highly suggested by health professionals, in areas where the practice of fluoridating water was not accepted. This practice is recommended for individuals, primarily children (who are at a greater risk of caries) in low-fluoride areas. Dietary recommendations
The U.S. Institute of Medicine (IOM) updated Estimated Average Requirements (EARs) and Recommended Dietary Allowances (RDAs) for some minerals in 1997. Where there was not sufficient information to establish EARs and RDAs, an estimate designated Adequate Intake (AI) was used instead. AIs are typically matched to actual average consumption, with the assumption that there appears to be a need, and that need is met by what people consume. The current AI for women 19 years and older is 3.0 mg/day (includes pregnancy and lactation). The AI for men is 4.0 mg/day. The AI for children ages 1–18 increases from 0.7 to 3.0 mg/day.
After the journalist pointed out several riders were suspected of dying from EPO, Ferrari said EPO was not dangerous, and only abuse of it was dangerous, saying, "Its also dangerous to drink 10 liters of orange juice." The orange juice comment has been widely misquoted. Ferrari was fired shortly after, but continued to work in the industry with top riders, allegedly including Lance Armstrong. That same year, Sandro Donati, working for the Italian National Olympic Committee, presented a report accusing Conconi of being linked to the use of EPO in the sport.In 1997, the Union Cycliste Internationale (UCI) instituted a new rule that riders testing above 50% haematocrit were not only immediately disqualified, but banned from racing for two weeks. Robert Millar, former racer, later wrote for Cycling News that the 50% limit was "an open invitation to dope to that level", pointing out that normally haematocrit levels would start "around 40-42%" and drop during the course of a "grand tour", but after EPO, they were staying at 50% for "weeks at a time". By 1998, EPO use had become widespread, and the Festina affair tarnished the 1998 Tour de France. One manager offered a 270,000-franc-per-month raise to Christophe Bassons if he would use EPO, but Bassons refused.In the 1998 Tour de France Stuart OGrady won one stage, held the Tour de France yellow jersey for three days, and came second in the points classification with the assistance of EPO.