Frequently Asked Questions

Get answers to common questions about STS Amino Acid Straightening.

Results generally last about 6–12 weeks depending on hair texture, growth rate, and care routine. Using sulfate-free products and minimizing heat styling will help prolong smoothness; your stylist can recommend the right touch-up schedule.

No. STS Amino Acid Straightening temporarily relaxes and smooths hair without altering the follicle structure. Over time and with normal washing, your natural curl pattern will gradually return, making the treatment reversible.

Yes, when applied by a trained professional STS is generally safe for colored or chemically treated hair. A consultation and strand test will identify any existing damage and determine if additional conditioning or precautions are needed.

Appointments typically range from 90 to 180 minutes depending on hair length, thickness, and any additional services. Your stylist will provide a precise timeframe during the consultation and explain each step of the process.

Aftercare includes using sulfate-free shampoos and conditioners, regular moisturizing treatments, and limited heat styling. Many clients are advised to wait 48 hours before washing; follow your stylist's specific instructions for best results.

Extensions and human-hair pieces can often be treated, but synthetic hair may be damaged. Consult your stylist — they will assess extension type, recommend protection or temporary removal, and perform a strand test if necessary.