In Thornleigh, the Keratin Treatment professionals listed here also serve the nearby towns of Wahroonga, Waitara, Beecroft, Hornsby. Contact any of them directly on WhatsApp — no middleman, no commission.
About Keratin Treatment
How to Prepare Your Hair Before the Visit
Wash your hair 24 hours before the appointment with a sulfate-free clarifying shampoo. Do not apply conditioner, oils, or styling products that day. Arriving with clean, dry hair helps the solution bond correctly during the flat-iron seal.
Compatibility with Colored or Bleached Hair
Keratin treatments can be applied over color, but bleaching within 7 days weakens the cuticle and raises break-off risk. Wait at least 2 weeks after any chemical service before booking. Use a protein mask 5 days before the appointment to reinforce strands.
Working Time Required for a Full Head at Home
Plan for 2.5 to 4 hours in the chair. The professional needs 30 to 45 minutes to apply the product section by section. Rinsing takes 10 to 15 minutes. Blow-drying adds 30 minutes. Flat-iron sealing is the longest step and runs 45 to 90 minutes depending on hair length and density. Long, thick hair can push the visit past 4 hours.
Price Drivers: Why Quotes Vary by 100% or More
Home visits cost more than salon work because of travel time and setup. Hair length and density drive product use: short hair needs 30 to 40 ml, long hair up to 120 ml. Brand matters too, with imported Brazilian formulas priced higher than local equivalents. Expect a 40% to 60% surcharge for very long or very thick hair.
Average Duration of Results on Different Hair Types
On fine, straight hair, results usually last between 2 and 4 months. On thick, wavy, or curly hair, the smoothing effect often lasts from 4 to 6 months. Frequent washing, chlorine, and salt water shorten the lifespan of the coating within days.
Aftercare Routine for the First 72 Hours
Do not wash, tie up, or tuck your hair behind your ears for the first 72 hours. Sleep on a silk pillowcase and avoid ponytail elastics. After day 3, switch to sodium-free shampoo and conditioner to protect the keratin seal.
When to Avoid the Treatment Altogether
Skip the service if your scalp shows open cuts, dermatitis, or active psoriasis. Postpone it for at least 3 months after a keratin straightening with strong formaldehyde. If you have very short hair under 10 cm, the treatment will not hold and is not worth the cost.
Pre-Wash and Product Removal Before the Appointment
Wash hair the morning of the visit using a sulfate-free clarifying shampoo. Skip conditioner, leave-in products, oils, or dry shampoo for at least 24 hours before. The cuticle must be clean so the keratin can bond properly. Any residue blocks absorption and leads to patchy results that show within the first wash.
Compatibility with Color-Treated or Bleached Hair
Keratin can be applied over colored hair, but timing matters. Wait at least 2 weeks after any chemical service, including dye, bleach, or highlights. Bleached hair tends to absorb more product and may darken slightly after treatment. A strand test on 10 hidden hairs is worth doing before committing to a full head.
Products Used and What to Ask About Them
Most kits rely on formaldehyde or glyoxylic acid as the active straightening agent. Ask the professional for the exact brand, the percentage of active ingredient, and the safety data sheet. If you are pregnant or have respiratory issues, request a formaldehyde-free formula.