Abstract: An apparatus and method are provided for flossing interproximal spaces between adjacent teeth in the presence of orthodontic braces and an arch-wire. The apparatus comprises a handle portion and a floss support portion comprising a first elongate member and a second elongate member separated by an intervening concave recess. The first elongate member comprises a narrow section and an angled first floss support, and the second elongate member comprises a narrow section and a second floss support. A floss strand extends under tension at an acute angle from the angled first floss support to the second floss support at substantially a right angle. The acute angle facilitates positioning the first floss support between a patient's upper teeth and the arch-wire while passing the floss strand into the interproximal space between the upper teeth. The substantially right angle facilitates positioning the floss strand into the interproximal spaces between the lower teeth.