My DD has enamel hypoplasia. Her milk teeth were fine, but her permanent teeth are affected. She has mottled, stained looking teeth, and uses sensodyne pronamel toothpaste.
Fortunately she knows all about the condition, and refused cosmetic dentistry offered to her by a new dentist (who really ought to have known about it). Had she gone ahead, it would have ruined her teeth.
This dentist has had several complaints made against him, and is undertaking retraining on the orders of the practice owner.
Sorry to say that all the fluoride toothpaste in the world hasn't helped DD's teeth. She goes for regular check ups and has a careful cleaning regime. The mottling doesn't bother her much now that she is older and happily married. None of her children have inherited the problem.