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. <EOS>