Chemical services should not be performed if the scalp analysis shows any signs of:

The cortex layer of the hair structure is responsible for the hair’s length and texture.

Chemical side bonds formed when two sulfur-type chains are joined together are:

The curvature permanent wrap uses zigzag partings to divide base areas.

Salt bonds can be broken by water, whereas disulfide bonds are broken by changes in pH.

The main active ingredient in true acid and acid-balanced waving lotions is:

The term pH is an abbreviation used for potential hydrogen.

Hydrogen bonds are easily broken by water or heat and are re-formed when the hair is:

The single flat wrap uses one end paper folded in half over the hair ends like an envelope.

Hair that has been treated with a hydroxide relaxer is unfit for permanent waving and will not hold a curl.