Personal care appliance with light-emitting end cover

An electric toothbrush, comprising:

• a housing and an end cover, with an opening being formed at an end portion of said housing in a longitudinal axis, said end cover is fitted into the opening,
• said end cover having an end wall and a side wall, said end wall being substantially perpendicular to said longitudinal axis, said the side wall extending from the end wall and being inserted into said opening along a direction of said longitudinal axis, said end wall and said side wall are integrally formed,
• wherein said electric toothbrush further comprises an end cover light-emitting device, which comprises:
• a light source arranged on a circuit board inside said housing close to said end cover;
• and
• a light transmission portion including at least a part of said side wall and at least a part of a peripheral portion, wherein a light incident portion of said light transmission portion is located at at least a part of said side wall, a light emission portion of said light transmission portion is located at at least a part of the peripheral portion of the side wall, and said light transmission portion is made of a first material that is light-transmissive,
• wherein said side wall includes a reflecting surface for transmitting light rays to the light emission portion, and an angle of said reflecting surface relative to incident light rays is set to reflect said light source toward said light emission portion,
• wherein each of the reflecting surface forms an interface between an optically dense substance and an optically rarer substance, said optically dense substance is said first material forming said light transmission portion, and said reflecting surface is configured relative to light rays from said light source and an incident angle of the light rays emitted by said light source relative to the reflecting surface is greater than a total reflection angle of said reflecting surface,
• a gap is formed between said reflecting surface and an inner surface of a segment of the housing surrounding the reflecting surface, and said optically rarer substance includes air filled in the gap, and
• wherein a groove is formed in an outer surface of said side wall of said end cover, and a sealing ring is accommodated in said groove.