Yes, over-tinting can occur when the eyebrows are left tinted for too long or if the dye used is too dark for your natural eyebrow color and skin tone. To avoid over-tinting, it's important to carefully choose the right shade of eyebrow tint and closely follow the instructions provided by the tinting product or a professional stylist. Additionally, never leave the dye on longer than the recommended time, and you can do a patch test on a small area of skin to ensure the shade is suitable.