**Core Concept**
Fluorosis is a condition caused by excessive intake of fluoride, leading to the deposition of fluoride ions in the bones and teeth. This results in a range of radiological features that can be observed on X-rays.

**Why the Correct Answer is Right**
Fluorosis can manifest in two main forms: dental and skeletal. Dental fluorosis is characterized by the presence of white or brown spots on the enamel, while skeletal fluorosis is marked by an increased bone density, particularly in the vertebrae, pelvis, and long bones. The increased bone density is due to the deposition of fluoride ions in the bone matrix, which leads to an abnormal calcification of the bone tissue. This can result in a range of radiological features, including an increased bone density, a ground-glass appearance, and an increased cortical thickness.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify any radiological features of fluorosis. While dental fluorosis can cause changes in the shape and texture of the teeth, it does not typically result in the radiological features mentioned in the correct answer.

**Option B:** This option is incorrect because it is a feature of osteoporosis, not fluorosis. Osteoporosis is characterized by a decreased bone density, which is the opposite of the increased bone density seen in fluorosis.

**Option C:** This option is incorrect because it is a feature of Paget's disease, not fluorosis. Paget's disease is a condition that results in an abnormal breakdown and reformation of bone tissue, leading to a range of radiological features, including an increased bone density and a characteristic "cotton wool" appearance.

**Option D:** This option is incorrect because it is a feature of osteomalacia, not fluorosis. Osteomalacia is a condition that results from a deficiency of vitamin D, leading to a softening of the bones and a range of radiological features, including a decreased bone density and a characteristic "salt and pepper" appearance.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the radiological features of fluorosis can be subtle and may not always be immediately apparent. A thorough medical history, including questions about fluoride intake and dental health, is crucial in diagnosing fluorosis.

**Correct Answer:** D.