What are the advantages and disadvantages of the conventional straightening method (CSM)?
CSM (Conventional Straightening Method), using sodium hydroxide hair relaxers, has been in use for the past 40 years or more and is still the most widely used straightening method in the Philippines and other countries like the U.S. ((US.)) It is effective in straightening out curly, frizzy, and kinky hair. The chemical product, sodium hydroxide in cream form, is inexpensive and the service is affordable, and takes more or less one hour only. However, because the chemical is strong and corrosive, it causes some damage to the hair: it leaves the hair dry, dull, and brittle. The hair becomes coarse and wiry and unhealthy. And the straightening effect does not last long. Moreover, color-treated hair cannot and should not be relaxed or straightened with sodium hydroxide hair relaxers as the hair can be severely damaged. One advantage of CSM or hair relax service is its cheaper and the procedure takes just about an hour. CSM also makes use of the other chemical, ammomium thioglycolate, or t
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