| 摘要 |
PROBLEM TO BE SOLVED: To develop a tooth brush having a draining function for making a washing effect by ultrasonic wave truly effective. SOLUTION: This ultrasonic tooth brush consists of a head part 10 implanted with brush, a handle part 20 for supporting the head part and a water feed tank part 30 in which a specified volume of water is stored. The head part 10 forms a head body 11 disposed with a piezoelectric vibrator 12 facing a recessed part 11a and partly disposed with a water feed port and drain port. A freely attachable and detachable brush body 15 is disposed along the peripheral edge of the head body 11. An electric circuit for feeding high frequencies to the piezoelectric vibrator 12 is disposed in part of the handle part 20. A water feed tank of the capacity to store the water necessary for at least one time of tooth brushing is disposed in the water feed tank part 30. The water feed tank part has a pump 22 taking charge of water feeding and/or water draining.
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