Every time I see a question in a news headline, I just answer it with "no." in my head and move on. 90% of the time it's the same answer the article arrives at and the other 10% of the time, I'll see a real headline about it from other sources anyway--with the actual lede in the title.
Sure, but why not just lead with a negative assertion instead of implying that there's an open question? The question implies that there is controversy, even when none exists.
Fact Checking RFK Jr's False Claims About Fluoride