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13. Use of hair dyes, permanents and straighteners and scalp recovery :: Posted Thursday, May 24, 2001 by admin ::
The hair's appearance can be altered by changing its color, through dying, or its shape, by permanent waving or straightening. These procedures all cause some damage to the scalp and hair follicle with should be promptly repaired with a scalp repair cream such as Folligen. If damage becomes excessive, serious hair loss may occur after a few years.
Dyes- Hair dyes lighten, darken and cover gray hair. Temporary hair dyes wash out after one shampoo. Gradual hair dyes produce a color change over a two- to three-week period. These dyes generally don't cause problems.
Semipermanent hair dyes that wash out after four to six shampoos, and permanent hair dyes that don't wash out can cause allergic reactions. These products should be tested on a small area of skin behind the ear or inside the elbow for 24 hours before using. Semi-Permanents have lower amounts of ammonia and peroxide, or none at all. Semi's have a wide variety of colors but the results with your specific hair type may be somewhat unpredictable as the the final tint or shade.
Permanent hair dyes are the only product that can make hair lighter or darker and should be applied by professional salons. Ammonium persulfate, sometimes used to lighten hair, can cause both irritant and allergic contact dermatitis in some individuals. It can also cause an immediate allergic reaction of hives and wheezing. Semipermanent hair dyes that wash out after four to six shampoos, and permanent hair dyes that don't wash out can cause allergic reactions. These products should be tested on a small area of skin behind the ear or inside the elbow for 24 hours before using.
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