Digestion and Absorption Question 91
91. A dental disease characterized by mottling of teeth is due to the presence of a certain chemical element in drinking water. Which of the following is that element ?
[1995]
(a) mercury
(b) chlorine
(c) fluorine
(d) boron
Show Answer
Answer : c
Hints & Solution
(c) The excess of fluorine in water causes a condition called fluorosis, which is identified by mottling of teeth (yellowish streaks) and abnormal bones liable to fracture etc.
