As such, the Cleveland Clinic suggests having your well water tested to check fluoride levels if you've noticed these signs ...

What are signs or indicators that there is an unsafe amount in ... of 4.0 mg/L to protect against skeletal fluorosis, a bone disease that can result from prolonged exposure to high fluoride levels. In ...

What are signs or indicators that there is an unsafe ... of 4.0 mg/L to protect against skeletal fluorosis, a bone disease that can result from prolonged exposure to high fluoride levels.