Excessive fluoride exposure during tooth development most commonly results in which outcome?

• A. Brittle and yellow teeth.
• B. Blue-gray staining of enamel.
• C. Enamel hypoplasia in all teeth.
• D. Yellow and discolored teeth.

Answer: (B)

Excess fluoride during tooth development causes dental fluorosis, a disturbance of enamel mineralization that leads to discoloration and mottled enamel. Because the enamel is hypomineralized, it can take up stains more readily and show noticeable color changes. Among the options, blue-gray staining of enamel best reflects the recognizable staining pattern that can accompany fluorosis. The other descriptions don’t capture the typical discoloration pattern seen with fluoride-related enamel changes: brittleness isn’t the defining feature, fluorosis isn’t simply enamel hypoplasia in all teeth, and while yellow discoloration can occur with various conditions, the characteristic staining associated with fluoride exposure is the gray-blue mottling described here.