Personal care appliance

A personal care appliance (100) comprising:

• a handle (110);
• a head (120) at an end of the handle (110), the head (120) having a connection portion (121) connectable to a replaceable device (200);
• a sensor (40) configured for sensing acceleration and rotational velocity;
• and
• a controller (42) configured to:
• monitor the sensed acceleration and rotational velocity over time;
• determine that the personal care appliance (100) has experienced an impact rendering the replaceable device (200) unsuitable for further use based on the monitored acceleration and rotational velocity, by the controller being further configured to:
• determine an orientation of the personal care appliance (100) using at least the monitored rotational velocity;
• compare the orientation of the personal care appliance (100) to an orientation range at a point of impact;
• determine that the personal care appliance (100) has experienced an impact rendering the replaceable device (200) unsuitable for further use when the orientation of the personal care appliance (100) is outside the orientation range;
• and
• transmit a signal indicating that the replaceable device (200) should be replaced in response to the determination that the personal care appliance (100) has experienced an impact rendering the replaceable device (200) unsuitable for further use.