[Features] The long curved neck makes it easy to reach the back of your teeth, which are difficult to brush. It features a unique combination of spherical and ultra-fine bristles at the tip. The spherical bristles adhere to the uneven surfaces of the teeth, scraping off plaque. The ultra-fine bristles scrape away plaque from deep within hard-to-reach gaps. The long curved neck curves to follow the alignment of your teeth, allowing the head to reach all the way to the back of your molars.