I would avoid it. I am against adding flouride to our bodies. I let my older kids have flouride toothpaste because they spit and they really really want those kinds but still avoid anything internal, and always used non-flouride toothpaste when younger than about 7yo. I have never had flouride treatments for me or any of our children, and never will. BTW not one of them has ever had a cavity and they have over time had their fair share of sugar and such.
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FWIW the dentists around here are very big on offering sealants. Yucky! I'm guessing yours will offer too, so you may want to learn about that before you are asked.