Adhesives
Hair replacement adhesives are medical-grade bonding substances that essentially act like glue. Depending on the type of hair replacement system, the adhesive is usually applied to the outermost edges of the hair matrix, allowing the rest of the scalp to breath once the hairpiece is secured to the head. It creates a temporary bond (about 4 to 6 weeks) that allows you to not only wear the hairpiece without worry, but also to wash and style it as if it were your own hair.
Prior to applying the hair system to your scalp, some hair replacement companies shave about a half an inch to an inch width of your own hair that surrounds your bald spot (matching the outermost edge of the hair matrix). This is said to give something more secure for the adhesive to hold the matrix to your head. As your hair grows, the hair replacement system loosens, though it's still "glued" to your hair. It is at this time that you'll go back into the hair replacement stylist, where the hair under the matrix is cut (to remove the piece from your head), the hairpiece is serviced (cleaned) and then reapplied to your scalp.
Tape
While the main portion of the hair replacement system uses a medical-grade adhesive, the front portion of the hairpiece (the hairline) is often adhered directly to the scalp with an adhesive tape. Basically, you're dealing with double-sided tape that needs to be reapplied each day to create a "natural" hairline. This is something you'll do on your own each morning. A thinner is sprayed to the front portion of the matrix to loosen the tape. The area is then washed, and another piece of tape is applied to the forehead, helping to bond the front portion of the matrix to your head.
Considerations
Before investing in a hair replacement system, have a skin test for the adhesive. Though the bonding solution is medical-grade, it doesn't mean that you won't have an allergic reaction to the stuff. Scalps can be sensitive, so you may not be able to wear the hairpiece after you've bought it. And some places don't have a money-back guarantee.
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