Dr. Julien 닥터줄리엔 on Instagram: "🦷 How to Turn Your Expander (Step-by-Step) Here’s the correct way to activate your rapid palatal expander (RPE): 1️⃣ Keep the key at a 90° angle. 2️⃣ Insert the key fully into the hole until you hear or feel the click. 3️⃣ Rotate the key toward the back of the mouth until the next hole appears in front. 4️⃣ Remove the key toward the tongue, not upward — this prevents reversing the turn. Slow, steady, and one full turn = one activation ✔️ If you miss a turn, don’t