Can over using flouride be bad for your teeth? can teeth become chalky looking, like white specs of enamel flaking off.

Yes - excessive: Use of Fluoride can result in fluorosis in the developing dentition. Advanced fluorosis in the permanent dentition has an appearance of enamel mottling and pitting with brown yellow stains. Use of daily Fluoride in a toothpaste or Fluoride treatment at your dentists office is not overusing fluoride. Best to consult with your dentist for an evaluation. Hope this helps.

Yes that is true: Yes too much Fluoride during development of a tooth can cause that. There are not too many studies that show that it can be harmful in adults when the teeth have developed

Time dependent: While the permanent teeth are forming and calcifying in the jaw bones, too much Fluoride can show a variety of color variations, depending on the amount of Fluoride added to the matrix. The critical time of enamel calcification occurs from birth until 8 years old. After that, only wisdom teeth could be affected.

Not at age 34: There are no known bad effects caused by Fluoride to erupted permanent teeth. Dental fluorosis can only develop on un-erupted permanent teeth prior to about age 8. If your teeth were originally normal and the enamel has since changed, this is not damage from fluoride, but damage from something else. You need to see your dentist to find out what is really going on here.