The major advantage of lithium hydroxide (No-Lye No-Mix relaxers) over sodium or potassium hydroxide is that it is slightly less irritating to the scalp than sodium or potassium hydroxide.
However, lithium hydroxide is not as effective in straightening excessively curly hair and in order to achieve acceptable level of straightening, more lithium hydroxide has to be added to the cream relaxer formula.
-- Dr. Ali Syed on No-Lye No-Mix Relaxers
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