Electric toothbrushes are in contact with water long term and most come with a charging base, so waterproofing and charging safety are high-frequency recall areas. Ningbo Xuntong Standard has catalogued the high-frequency non-conformities from many tests and gives practical corrective-action plans to help businesses minimise risk before mass production.

1. Waterproofing (IPX rating)

The whole unit and the charging contacts must meet waterproof ratings such as IPX7, and electric strength in the damp state and moisture resistance are mandatory checks. Ningbo Xuntong Standard advises manufacturers to focus on the sealing structure of the shaft, buttons and charging contacts to avoid excessive leakage current in the damp state.

2. Charging safety

Temperature rise, leakage current and abnormal operation of inductive and contact charging are the focus; poor-quality charging bases can overheat or even catch fire. The current-limiting and temperature-limiting strategy of the charge-management chip directly determines whether the product passes the abnormal test.

3. Structure and materials

Brush-head fixing, battery safety and enclosure sealing frequently cause problems. Ningbo Xuntong Standard recommends sealed and redundant charging designs and an independent safety assessment for the battery.

4. Corrective-action path

Corrections usually start from three aspects: strengthen sealing of the whole unit and charging contacts, optimise the charging temperature-control strategy, and select reliable batteries with a safety assessment. Ningbo Xuntong Standard provides pre-testing and corrective-action guidance for electric toothbrushes, covering waterproofing, charging and structure in full. For related regulations and standards, see the Regulations & Standards section; for appliance testing capability, see the Ningbo Xuntong Standard official website; visit the appliance safety standards resources. Putting testing up front can significantly reduce tooling-change costs.