Build-A-Brush Expansion Pack Get ready to make a frighteningly good toothbrush with our Monsters and Heroes expansion pack – the perfect add-on for your Build-A-Brush. This awesome pack includes 3 super-fun new bits that twist right onto your brush: * Monster Bit * Dinosaur Bit * Superhero Bit Each bit twists onto your Build-A-Brush, so you can mix, match, and create a new toothbrush every day! Collect them all and keep brushing fun, fresh, and full of personality! Build-A-Brush and associated products are not intended for children 3 years of age and under.