Abstract: A pre-formed tooth crown comprises a connection at the lateral surfaces capable of bridging three-tooth crowns. The connection further comprises a male fastener at one lateral surface and a female fastener at the opposing lateral surface, where the male fastener has a center hole and the female fastener has a corresponding central through hole. In order to form a crown bridge with at least three-tooth crowns, the male fastener of one tooth crown can engage with the female fastener of an adjacent tooth crown. While after the crown bridge is located onto the patient's teeth, a lining material stuffed inside the tooth crowns can be then squeezed from one tooth crown to an adjacent tooth crown via the center hole and the central through hole for ensuring the binding within the crown bridge.

Abstract: A dental flosser including a holder and an operation end keeping a certain contact angle with the holder, and the operation end having a horizontal section on the front end, and floss mounted on the front edge of two ribs resembling an arch on the operation end so that the floss is kept perpendicular to the holder. The structure of such dental flosser makes it easy for stretching floss into the space of each tooth and closely touching the gum line. A firm and perpendicular thrust force and tension force may be formed upon the crown surface of the tooth space by pushing the holder forward or pulling it backward with the hand, with the stream of force in conjunction with moving dental flosser up and down made easier for the floss removing the dental plaque from the crown surface. Such an easy removal of dental plaque has even more significant effect for molars located deeper inside the mouth.

Abstract: The present invention relates to a storage box for dental equipment, comprising a box and a cover which are joined together with pivotal parts; a chute is made on the box and laid with a plurality of check plates; along the close end the check plate, has a plurality of hopper type slots interweaving with the check plates; the slots may hold the drilling/filing needles which are separated by these check plates, and head end of each needle is projecting over the check plate in facility of chucking up the needle with the clip; the open end of the cover may receive the contact side of the notch, when the cover is open from the box it may be turned to the bottom of the box and holding up the back of the box so that the box may be leaning inclined upon the notch of the cover to ensure that drilling/filing needles are securely placed in the box.