If your electric toothbrush charging light doesn't come on, there could be a few possible reasons. Here are some possible solutions:
1. Check the power supply: First, make sure the charging base of the electric toothbrush is plugged into the power socket, and the plug and socket are firmly connected. Also make sure there is nothing wrong with the socket itself. You can try plugging other electronic devices into the same socket to check if there is power.
2. Charging base problem: Check whether the charging base is working properly. Sometimes the base may be damaged or faulty. Try placing your electric toothbrush on a different charging base to see if it charges.
3. Charger problem: Check whether the charger of the electric toothbrush is damaged or faulty. The charger may need to be replaced.

4. Battery problem: If the electric toothbrush is rechargeable, the battery may be damaged and cannot be charged. In this case, it may be necessary to replace the battery or seek service.
5. Charging indicator light problem: The charging indicator light of some electric toothbrushes may not always light up during charging, but will only light up under a specific charging state. Consult the product manual to learn about the charging indicator light function and how to use it.
6. Contact customer service: If none of the above methods can solve the problem, it is recommended to contact the customer service department of the electric toothbrush brand. They can provide you with more detailed guidance and solutions.
In short, if your electric toothbrush charging light doesn't come on, first troubleshoot some basic issues, and then try different solutions depending on the situation. If the problem cannot be solved, it is best to consult a professional or the brand's customer service.