Connected to a suction device, you can brush your teeth while suctioning saliva. As shown in the photos, I offer it cheaper than online retailers. Amazon: 325 yen per piece 325 x 20 = 6500 yen, but I'm offering it for 4980 yen. If you're concerned, please refer to my transaction history for reassurance. It's convenient because it has an on/off switch to control the suction right at your fingertips.