Q. My 20 years old daughter has great teeth in good condition but is concerned about “snow capping” – where her top 2 front teeth have a bright white markings compared to her normal tooth colouring. This is only noticeable in the morning ( and wears off during the day), it doesn’t occur if she sleeps with her orthrodontic retainer in (made 6 years ago). We think it is because she sleep with her mouth open! What can she do about this? Her dentist is loathe to recommed veneers or crowns because her teeth are so healthy. Any suggestions please?,