My wife works in dental insurance so I asked her. She said for the general public, the effectiveness of the sealant decreases as the client ages, because an adult's tooth is more smooth than a child's. So there's a critical age where the cons outweighs the pros.

In the US I grew up in LA, California so I think I'm understanding the pattern now.

Thanks for the insight. Honestly the nerve of some people...

What country were you raised in? I was raised Catholic in the Philippines and in the US and it was made explicitly clear in my education that Catholics are Christian.