Fluoride in too much doses can be harmful to your health so although fluoride can be good for your teeth health it can cause health problems elsewhere in our bodies.
I personally don't drink any water with fluoride and don't even use fluoride based toothpaste. I make my own toothpaste with baking soda and brush my teeth naturally with the baking soda toothpaste instead.
I've heard that fluoride can cause discoloration of a child's permanent teeth if the child gets too much fluoride before the age of 8 years old.
I've also heard that drinking water that contains fluoride and even bleach can lead to bladder conditions such as bladder cancer, bladder infections, Urinary Tract Infections as well as kidney disease.
I drink bottled water that doesn't contain fluoride or chlorine in it.