Hair coloring by lay people may not be sufficiently accurate. Hair that has been damaged by excessive exposure to chemicals is considered "over-processed". This results in dry, rough and fragile hair. In extreme cases, the hair can be so damaged that it breaks off entirely. The main cases of hair breakage are: Lack of moisture and oils, poor diet, stress, over processing or illness. Skin and fingernails are made of a similar type of keratinized protein as hair. That means that drips, slips and extra hair tint around the hairline can result in patches of discolored skin. This is more common with
Artificial nails Over time, exposure to MMA could cause lasting effects such as drowsiness, light-headedness, and trembling of the hands. Musicians who play stringed instruments may wear artificial nails as an aid in playing. Some guitarists like Don Ross, Doyle Dykes and James Taylor are known for doing so. Many intermediate and advanced classical and finger-style guitarists use varieties of fake nails to obtain a consistent, clear and bright tone with each pluck. The players of many ancient Chinese instruments, like the guqin, pipa, and ruan, also commonly used artificial nails. Even the Indian instrument sarod requires nails for tipping, so many