Deciduous teeth do not show fluorosis because:
Placenta acts as a barrier
Fluoride is taken up by the fast growing skeletal tissue
The calcification time of deciduous teeth is less
All of the above
Option 1: Placenta acts as a barrier.
Some authors have said that the placenta acts as a complete barrier to fluoride, others have said that it is only partial. Some have said that the placenta only acts as a barrier, when there is a sudden increase in the maternal plasma fluoride level.
Option 2: Fluoride is taken up by the fast-growing skeletal tissue.
Fluoride’s actions on bone cells predominate as anabolic effects both in vitro and in vivo. More recently, fluoride has been shown to induce osteoclastogenesis.
Option 3: The calciﬁcation time of deciduous teeth is less.