As the internet is rife with rumours and misinformation, it is time to clear the air (again) over some concerns that somehow have a long shelf life and keep on coming back to haunt the minds of patients searching for information. The concern over fluoride is topical, because it has risen yet again, and just like a few years ago, it will turn out to be a complete hoax and based on a serious misunderstanding of what fluoride overdose is, how fluoride works and how harmful it is to people. Below, I will be dealing with these issues, and also mention what a fluoride overdose looks like.