The horizontal lines that appear when you raise your brows. Treated with small, evenly spaced doses so the forehead softens without going flat — you keep your expression.
Forehead lines form from years of the same expression — surprise, focus, concentration — repeated until the crease stays visible even at rest. Botox is dosed conservatively here and adjusted over a few sessions if needed, since a forehead that's fully frozen tends to look less natural than one that's simply softened. It's frequently paired with the glabella (the “11s”) so the whole upper face reads as calm rather than stern.
This is general education, not a treatment plan. What you actually need depends on your anatomy, muscle strength, and goals — Rocio determines that with you in person.