A bad salon experience with coily hair doesn't just mean a style you didn't love. It can mean heat damage, traction breakage, scalp irritation, or losing months of length in a single session. The vetting happens before you sit down, not after. Here are the questions to ask and what the answers tell you.
What is your experience with 4C natural hair specifically?
Not "natural hair" generally. Not "coily hair" broadly. 4C specifically. A stylist who works primarily with looser curl patterns may not have the experience with tightly coiled textures to handle your hair well. The answer should include specific techniques and products they use for tightly coiled clients, not just assurances that they "work with all hair types."
Can I see examples of work you've done on hair like mine?
Any stylist who works regularly with 4C natural hair has photos. They should be able to show you examples of styles on clients with a similar texture to yours: not just photos of looser textures or relaxed styles. If they can't produce examples, that tells you something about how much of their work is actually in the texture you have.
What heat settings do you use when blowdrying or flatironing 4C hair?
The correct answer for 4C hair is low to medium heat: typically not above 380 to 400 degrees Fahrenheit, and always with a heat protectant. If the answer is "high heat is what straightens it" without any mention of heat protection, leave. High heat without protection is how 4C hair gets permanently altered and takes months to recover from.
What detangling method do you use on natural hair?
The answer should involve wet detangling on conditioner-saturated hair, starting from the ends, with a wide-tooth comb or fingers. A stylist who says they detangle dry or with a fine-tooth comb isn't handling tightly coiled hair with the technique it requires.
What products will you be using and can I see the labels?
You have the right to know what's going on your hair. A refusal to show you products is a red flag. You're looking for whether the products are appropriate for your texture and whether there are any ingredients you're sensitive to or want to avoid.
What's your approach to tension on the edges?
This is especially important before braids, twists, or any style that involves the hairline. The answer should indicate awareness that edges are fragile and should be handled with less tension than the rest of the style. If edge care isn't in their vocabulary, your hairline is at risk.