Skeletal Fluorosis Phases
| Osteosclerotic phase | Ash concentration (mgF/kg) | Symptoms and signs |
| Normal Bone | 500 to 1,000 | Normal |
| Preclinical Phase | 3,500 to 5,500 | Asymptomatic; slight radiographically-detectable increases in bone mass |
| Clinical Phase I | 6,000 to 7,000 | Sporadic pain; stiffness of joints; osteosclerosis of pelvis and vertebral spine |
| Clinical Phase II | 7,500 to 9,000 | Chronic joint pain; arthritic symptoms; slight calcification of ligaments' increased osteosclerosis and cancellous bones; with/without osteoporosis of long bones |
| Phase III: Crippling Fluorosis | 8,400 | Limitation of joint movement; calcification of ligaments of neck vertebral column; crippling deformities of the spine and major joints; muscle wasting; neurological defects/compression of spinal cord |
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