The number one toothbrush on @cosme's review ranking. - About the CS5460 - The toothbrush bristles are ultra-fine, with a diameter of 0.1mm to 0.15mm. The number of bristles is about 2-10 times that of a regular toothbrush (comparison figures extracted from the Mainichi Shimbun article "Gimon Hyokai"). The CS5460, as its name suggests, has 5,460 bristles. With these ultra-fine bristles and an overwhelming number of bristles, the tips reach deep into the gingival sulcus, fissures, and interdental spaces without damaging the gums. Furthermore, the bristles use Curen® fiber (Curen fiber), a self-developed polyester, so they are soft yet elastic, durable, and economical. Experience the softness of cream cheese and the adhesiveness of chocolate butter. No problem with immediate purchase without comment. We will ship on the same day if possible, but please understand that it may be shipped the next day depending on the timing.