Why can the Xiaomi Oscillation Electric Toothbrush not be used after being fully charged?

If the Xiaomi Oscillation Electric Toothbrush is not used after being fully charged, please refer to the following steps to troubleshoot:
1. The toothbrush cannot be powered on while it is charging. When the battery is fully charged, the indicator will remain solid white, indicating that the charging process is complete.
2. The battery level indicator stays in white after being fully charged. You can press the power button to see if it turns on normally.
3. If the toothbrush still shows no response after the above steps, please contact our local official after-sales service center for further assistance.