Orthodontic appliance and orthodontic system

An orthodontic appliance, comprising:

• a main body portion and a traction component, a transmission component, and a position occupying component disposed independently of each other, wherein the traction component is detachably connected to the main body portion and/or the transmission component to perform switching between a working state and a non-working state;
• the transmission component and the position occupying component are disposed at the main body portion, the transmission component is linkagely connected to the position occupying component, the main body portion is disposed with a trench, when an effective space of the trench needs to be changed, the traction component is linkagely connected to the transmission component, thereby driving the position occupying component to at least partially enter or exit the trench or move in the trench along a trench width direction, so as to change the effective space of the trench;
• when the position occupying component is driven to be moved, the working state or the non-working state is not switched by the traction component,
• wherein the transmission component is disposed with a transmission fitting member, and correspondingly, the traction component is disposed with an engaging end, when the engaging end of the traction component is engaged with the transmission fitting member, the traction component is linked to the transmission component,
• wherein when the transmission component is connected to the engaging end of the traction component, and the engaging end of the traction component is not engaged with the transmission fitting member, the traction component does not link the transmission component.