A toothbrush comprising a head and a handle wherein the handle comprises a first part and a second part, which first and second parts are removably connectable to one another via a locking mechanism and wherein the handle has a non-circular cross-section, where the locking mechanism comprises a bayonet element and a socket; one of the bayonet element and the socket is integrally formed with the first part of the handle; the other of the bayonet element and the socket is integrally formed with the second part of the handle and where the socket comprises an axis, an opening and first and second channels which channels are positioned transversely opposite one another, wherein each channel comprises: a first channel portion extending axially from the opening and having a first transverse dimension, and a second channel portion extending axially from the first channel portion having a second transverse dimension larger than the first transverse dimension; and the bayonet element comprises an axis and first and second protrusions, which protrusions are positioned diametrically opposite one another, wherein each protrusion extends outwardly from the bayonet element, is axially receivable by a respective first channel portion and is transversely receivable by a respective second channel portion, and where the bayonet element further comprises one of a detent and an indent, the socket further comprises the other of the detent and the indent, and the detent is receivable within the indent whereby the bayonet element is lockably receivable within the socket, wherein the handle has a substantially trapezoidal cross-section, characterised in that, each part of the handle shares the same non-circular substantially trapezoidal cross-section. the locking mechanism comprises a bayonet element and a socket; one of the bayonet element and the socket is integrally formed with the first part of the handle; the other of the bayonet element and the socket is integrally formed with the second part of the handle and where the socket comprises an axis, an opening and first and second channels which channels are positioned transversely opposite one another, wherein each channel comprises: a first channel portion extending axially from the opening and having a first transverse dimension, and a second channel portion extending axially from the first channel portion having a second transverse dimension larger than the first transverse dimension; and the bayonet element comprises an axis and first and second protrusions, which protrusions are positioned diametrically opposite one another, wherein each protrusion extends outwardly from the bayonet element, is axially receivable by a respective first channel portion and is transversely receivable by a respective second channel portion, and where the bayonet element further comprises one of a detent and an indent, the socket further comprises the other of the detent and the indent, and the detent is receivable within the indent whereby the bayonet element is lockably receivable within the socket, wherein the handle has a substantially trapezoidal cross-section, characterised in that, each part of the handle shares the same non-circular substantially trapezoidal cross-section.