Dental Teens and Pre-Teens Braces. Dentists recommend wearing braces as soon as the defect is detected, without pausing the treatment. Here are some of the common problems that may push a teen to start wearing braces: crossbite, overbite, crowding, issues with spacing, protrusion, and dental midline misalignment. An overbite is when the lower front teeth bite into the mouth’s roof, causing certain discomfort. A crossbite stands for the upper teeth to be located inside the lower row.