Water fluoridation isn't necessarily a good thing. It can be good for teeth, sure, but it's not really good for overall health. Besides, we have water fluoridation here in the US, and my Mom's teeth are still terrible. They have been since she was a child. I have good teeth because of my Dad. She brushes and flosses every day, I do the bare minimum and get by fine.
One of them is crooked, one of her back teeth just fell apart, and at one point they even thought they'd have to break her jaw to deal with the way one of them grew in.
I think at the end of the day, bad teeth just run in some families, and your hygiene habits along with the foods you eat either help or hinder what you get by nature.