Protein building blocks of hair that link together to form tiny protein fibers

• Side Bonds

• Salt Bonds

• Amino Acids

also known as End Bonds, connect amino acids (end to end) that form polypeptides

• Peptide Bonds

• Side Bonds

• Salt bonds

also known as Cross Bonds, connect polypeptide chains side-by-side; responsible for strength and elasticity

• Amino Acids

• Side Bonds

• Miscible

physical side bond (cross bond) easily broken by water or heat; reforms when hair cools and/or dries

• Hydrogen Bonds

• Salt bonds

• Amino acids

weak physical side bonds (cross bonds) easily broken by change in pH; reform when pH balance is restored

• Base cream

• Side bonds

• Salt Bonds

strong chemical side bonds that can only be broken by chemical solutions

• Disulfide Bonds

• Salt bonds

• Immiscible

when a substance is able to be mixed with another substance

• Side bonds

• Miscible

• Peptide bonds

when a substance is not able to mix with another substance

• Miscible

• Salt bonds

• Immiscible

a scale ranging from 0 to 14 that measures if a product is an acid (0 to 6.9), an alkaline (7.1 to 14), or neutral (7)

• pH Scale

• Miscible

• Potential Hydrogen (pH)

to chemically alter naturally curly or wavy hair into a straighter form

• Lanthionization

• Chemical Relaxing

• Perm