What causes white marks on teeth?

Nicotine and coffee stains. If they are definable actual marks and not just faded staining, then the lines can be caused by an antibiotic, or steriod. Like a nasal spray. Just keep brushing and go to...

White patches on your teeth come from to much plaque that build up from over the years and can later on in life leave holes in the area that they are, to prevent. Make sure you brush that area...

This sounds like typical extrinsic stain. Common culprits are tea, wine, tobacco, or coffee. See your dentist and dental hygienist for a thorough dental cleaning (prophylaxis).

lack of calcium in your body causes white stripes on teeth and nails.

My mom and I both have this problem and when she asked her dentist, he said it is an allergic reaction to SLS's which are anionic surfactants used in whitening toothpastes and among 90% of personal...