Abstract: A toothbrush tip for a motorized toothbrush with a first brush head and a second brush head. The second brush head encircles the first brush head. The first and second brush heads has different axes of rotation. The first and second brush heads are driven by an elongated shaft. The shaft engages the second brush head. Interactive gear teeth associated with each first and second brush heads allows the first and second brush heads to rotate at opposite direction, upon being driven by the shaft.

Abstract: A disposable saliva ejector has a strainer tip at its distal end. The strainer tip has a plurality of slots through which saliva, blood etc. can be extracted from the patient's mouth. A protective flange is located adjacent the strainer tip, extends parallel to it, and is spaced apart from it. The space between the flange and the tip is sufficiently small that the patient's flesh is unlikely to become interposed between the tip and the flange. For this reason, slots in the region of the flange will likely always remain unblocked. For this reason, the tip and flange do not become tightly wedged against the patient's flesh as a result of the vacuum supplied to the ejector.

Abstract: A dental strainer unit includes a plastic strainer, a plastic strainer cap, and a transparent, non-rigid plastic housing. The strainer unit can be cost-effectively manufactured and easily disassembled and cleaned. The strainer cap can be manufactured in a variety of sizes to permit different aspirator devices to be attached thereto, and the housing can be snap-fit over the enlarged head of a saliva ejector valve. The dental strainer unit can be used in a modularized dental aspiration system.