So many reasons!
- Brows lighten from the sun so the ends are lighter than the inner edges meaning that when you tint them, the full hair has color and definition
- Years of over-tweezing leads to sparse brows, if you add color to them, they naturally will look fuller and cover up patchy areas
- Finer hairs will be more pronounced when tinted giving you a fuller looking brow. This is especially true for the very fine and non pigmented hairs at the start and end of your brows
- Use less make up and save time in the morning !