lack of calcium in your body causes white stripes on teeth and nails.
anemia
Secondhand smoke causes great discomfort for many nonsmokers, making it hard for them to breathe.
Emily Brown
No
6 Nonsmokers - 2011 was released on: USA: 20 January 2013 (correction)
calcium
k
Eggshell nails are caused by a deficiency of essential vitamins and nutrients in the nails matrix. Vitamin supplements and proper nutrition will help the nail to grow healthier.
Rusty baseboard nails are caused by moisture. The moisture can be caused by heavy rain and humidity or structural damage.
See the related link on what causes brown discharge after period.
I did an experiment on this in 4th grade. When I put iron nails in bleach, the nails turned a reddish hue at first, then faded to a brown. This is because of oxidation. The bleach stimulates the ions in the iron, causing them to swirl in a circular motion, thus creating the reddish brown color.