Original sentence: Fatalities have been reported in some human individuals at doses as low as 71 mg/kg of sodium fluoride.In high concentrations fluoride compounds are toxic.In mice, a "semilethal dose" is estimated to be 184 milligrams of stannous fluoride per kilogram of body mass.Skin or eye contact with many fluoride compounds (in high concentrations) is dangerous.Symptoms of acute toxicity have been reported to occur in rodents at chronic doses as low as 1 mg/kg
Edited sentence: A "certainly lethal dose" is estimated to be 32-64 fluoride mg per kilogram of body mass, although fatalities may occur in some individuals at doses as low as 5 mg/kg.In  high concentrations fluoride compounds are toxic.Skin or eye contact with many fluoride compounds (in high concentrations)  is dangerous.Symptoms of acute toxicity (e.gastrointestinal distress) have been reported to occur at doses as low as 0.1 to 0.3 mg/kg