I have white spots on my teeth but they weren't there before, how do they develop? is it something in my diet? how to get rid of them?

Calcification ,: Did you bleach your teeth ?or you had braces? If so these whitish spots appear after bleaching , most often they will go after the tooth is dehydrated , or oral hygiene was not good while you have braces . Or they are always there and you never looked or paid close attention , to get rid of them you need to see your dentists , he can determine the depth and best way to remove them use composite to