Everyone has bacteria in their mouth. Dental plaque forms in your mouth after eating and the bacteria live a very good life in the plaque. Dental plaque is sticky and attaches to the teeth. Once the bacteria living in the plaque eats the sugars in your diet, they produce more of themselves and give off acid. The acid begins to eat away at the enamel on your teeth creating a white spot.
These white scars are actually the beginnings of a full blown cavity and they are permanent damage to the teeth. No one wants to have straight teeth that are scarred with white marks. Your orthodontist can only do so much to prevent the decalcification process that causes these white marks. The only thing that can prevent them completely is to clean off the plaque consistently and thoroughly after meals. Dig with the bristles of your toothbrush under the wire and in between the teeth, wire and gums.
Be somewhat aggressive, remember this plaque is sticky and takes a little bit of elbow grease! After brushing and flossing inspect the teeth for any debris and revisit any areas that are not pristine. If there is no food or plaque on any surfaces of the teeth you can feel secure about the job you did. Consistency is key! Keep those choppers clean and healthy and you should not have to worry about white scars!