1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.
An Intiative by Sri Chaitanya
a
softer
b
harder
c
pale
d
whiter
answer is B.
(Unlock A.I Detailed Solution for FREE)
Best Courses for You
JEE
NEET
Foundation JEE
Foundation NEET
CBSE
Detailed Solution
The F- ions make the enamel of teeth much harder by converting hydroxyapatite, 3Ca3PO42·Ca(OH)2 the enamel on the surface of the teeth, into much harder fluoroapatite, 3Ca3PO42·CaF2. F- ions have nothing to do with colour of teeth.