Dentek Wide Brush Picks are used for cleaning braces and are perfect for your teen. They're normally $2.79 a pack, but I heard about a coupon code to make them $0.50. And if you buy 20 packs or more ($10), you get free shipping.
The coupon code is: test1234
The link is: http://www.dentek.com/shop.php?target=products&product_id=29
Hopefully this is valuable to some of you!