The invention relates to a method for mending split ends of hair comprising contacting the hair with split ends with a composition comprising at least cationic polygalactomannan containing non-ionic hydroxyalkyl substituents and having a Brookfield RVT viscosity at 25° C. and 20 rpm greater than 700 mPa·s, at a concentration of 1 pbw in water, for instance comprised between 700 and 1,200 mPa·s.