Improved straightening process for keratin fibers

A method for straightening keratin fibers, comprising:

• (i) applying a composition onto the keratin fibers;
• (ii) rinsing off the keratin fibers,
• (iii) optionally drying the keratin fibers after rinsing;
• and
• (iv) straightening the keratin fibers at a temperature of more than 50° C., wherein the composition comprises:
• (a) at least one compound chosen from glyoxylic acid, glyoxylic acid solvates, glyoxylic acid salts, glyoxylic acid esters, glyoxylic acid amides, or mixtures thereof;
• (b) at least one betaine compound;
• and
• (c) water.

A composition for straightening keratin fibers, comprising:

• (a) at least one compound chosen from glyoxylic acid, glyoxylic acid solvates, glyoxylic acid salts, glyoxylic acid esters, glyoxylic acid amides, or mixtures thereof;
• (b) at least one betaine compound;
• and
• (c) water.

A kit for straightening keratin fibers, comprising:

• at least one heater configured to provide heat to the keratin fibers at a temperature of greater than 50° C.;
• and
• at least one composition comprising:
• (a) at least one compound chosen from glyoxylic acid, glyoxylic acid solvates, glyoxylic acid salts, glyoxylic acid esters, glyoxylic acid amides, or mixtures thereof;
• (b) at least one betaine compound;
• and
• (c) water.