Abstract: An oral hygiene device comprises a rotating body 22 mounted to a rotating shaft 21 of an electric motor 14, an output shaft 11 resiliently supported via a resonance pin 25 to be swingable finely, a drive magnetic body 23 provided on the rotating body 22, and a driven magnetic body 31 provided on the output shaft 11 to face the drive magnetic body 23 so as to be out of contact therewith. The drive magnetic body 23 and the driven magnetic body 31 are composed of permanent magnets, and as the rotating body 22 revolves, a varying magnetic field is generated between the both magnetic bodies 23, 31 to cause vibration of the output shaft 11 at high speed. In this manner, there are provided a vibration generating device, which can be manufactured at low cost and efficiently transmits vibration, and an oral hygiene device using the same.

Abstract: A periodontal pocket cleaning device is provided which has a very excellent effect for the prevention of periodontal diseases, which is least liable to cause injury to the periodontal pocket, which can be used at any place without limiting the place of its use, which is able to obtain a stabilized atomized jet without being influenced by the height position of the handy probe, and which is available at a low cost. The periodontal cleaning device includes a handy probe provided with an air-jet ejection mechanism, an air pump for producing compressed air, and an air-feeding tube for feeding the compressed air from the air pump to the handy probe. The handy probe is provided with a liquid storage tank for storing liquid agent such as water or liquid chemicals therein. The jet-out pressure of the compressed air to be ejected from the nozzle of the handy probe is set in a range of from 0.05 to 0.08 kg/cm.sup.2. The jet-out quanity of the compressed air is set in a range of from 2 to 30 l/min.

Abstract: An oral hygiene instrument according to this invention by means of vibration generating means vibrates by way of a holder member an oral hygiene tool removably attached to the holder member and comprises a cap member having a cap side thread portion which meshes with a holder side thread portion formed at a first end of the holder member which cap member is removably attached to the first end of the holder member and closes an opening in the first end of the holder member, a seal ring fitted on a portion of the holder member or the cap member at the external end of the part where the two members mesh which seal ring is pressed upon by either the cap member or the holder member and seals the gap between the holder member and the cap member within a range of a predetermined angle of screwing of the cap member with respect to the holder member from a late stage to completion of said screwing, and a holder side contact piece and a cap side contact piece mounted in the holder member and the cap member respectively