Why does the Xiaomi Oscillation Electric Toothbrush make abnormal noise or vibrate excessively when starting?

If the Xiaomi Oscillation Electric Toothbrush makes abnormal noise or vibrates excessively when starting, please refer to the following information:
1. The motor of the Xiaomi Oscillation Electric Toothbrush will generate noise when it is working. The noise remains under 62 decibels.
2. It is recommended to start with the gentle mode of the Xiaomi Oscillation Electric Toothbrush to help you gradually adapt to the vibration. Once you're more comfortable, you can switch to other modes.
3. If the sound becomes abnormal, please contact the purchase platform or Xiaomi official after-sales support for assistance.
4. Make sure the brush head is properly installed. A loose or incorrectly attached brush head may cause abnormal noise or strong vibration.
5. Check whether any objects are stuck between the brush head and handle, as this may affect the balance of the motor and lead to unusual vibration or noise.