The present application discloses a drive unit for oral cleaning, a toothbrush handle, and an oral cleaning device; the oral cleaning device at least includes a driving body and a motion detection component, wherein the driving body extending along a first axis includes a static assembly and a rotary assembly, the rotary assembly is rotatably mounted on the static assembly, the static assembly at least partially surrounds the rotary assembly, and an accommodating chamber is formed in the static assembly; the motion detection component located in the accommodating chamber includes a motion detection assembly and a motion feedback assembly, the motion feedback assembly is connected with the rotary assembly and rotates with the rotary assembly, the motion detection assembly is directly connected with the static assembly, and the motion detection assembly detects a motion position of the rotary assembly through the motion feedback assembly.

A mouthpiece including a body having a recess delimited by a flexible recess wall, the recess configured for encompassing a plurality of dental positions. The body is provided with a pressure chamber for containing a fluid under pressure. The recess wall is configured to deform by reciprocatingly increasing and decreasing a pressure in the pressure chamber between a decreased pressure condition and an increased pressure condition. The recess wall has a local deformability such that, when reciprocatingly increasing and decreasing the pressure in the pressure chamber, a shape of the recess wall locally changes. In the increased pressure condition, the shape of the recess wall is locally adjusted to the local shape of the dental positions encompassed by the recess wall. In the decreased pressure condition, the shape of the recess wall is locally less adjusted to the local shape of the dental positions encompassed by the recess wall.

A mouthpiece including a body having a recess delimited by a flexible recess wall, the recess configured for encompassing a plurality of dental positions. The body is provided with a pressure chamber for containing a fluid under pressure. The recess wall is configured to deform by reciprocatingly increasing and decreasing a pressure in the pressure chamber between a decreased pressure condition and an increased pressure condition. The recess wall has a local deformability such that, when reciprocatingly increasing and decreasing the pressure in the pressure chamber, a shape of the recess wall locally changes. In the increased pressure condition, the shape of the recess wall is locally adjusted to the local shape of the dental positions encompassed by the recess wall. In the decreased pressure condition, the shape of the recess wall is locally less adjusted to the local shape of the dental positions encompassed by the recess wall.