MYTH: Vinegar should be used as an after shampoo rinse for shine. True, back in the day.
The acidity of both of these products helped to remove soap residue from the hair after washing. They left the hair shiny and squeaky-clean.
However, modern, detergent based, shampoo leaves no soap scum on the hair and, again, with the popularity of hair color and permanent waves, the use of a rinse with this amount of acidity is not recommended.
MYTH: Train your hair by continually combing it in the same style.
Most hair experts will agree on the fact that research has found hair to be untrainable. New hair, growing in, is going to go it's own direction unless you use styling products, blow dryer, curling iron or other styling technique to redirect it. Once you shampoo the "set" out, you start again.
MYTH: Shaving your legs will cause heavier, darker hair growth. Total Myth.
Shaving will not make hair grow thicker or darker. We have a certain number of hairs growing on our bodies and this does not change by shaving. Change of color sometimes may occur, but is a natural process whether the hair has been shaved or not.
MYTH: Cutting hair will make it grow faster. Again Myth.
The rate of growth, at the root, remains the same. Trimming the ends from the hair will help it to grow longer, but only because when split ends are allowed to remain, they will continue to split up higher, causing the hair to break off, thus shortening the hair.