An investigation that shows the terrible consequences of the production and use of fluoride. From the mines of Silius in Sardinia, where the mineral is extracted, we set out on a journey that touches the numerous realities involved such as the Veneto and the Derbyshire national park in England. Realities involved in the extraction, processing and various industrial productions that suffer the consequences in everyday life. Environmental, food and beverage monitoring by institutions and private companies. The different reactions of public opinion to the awareness of the state of things.