The Oral-B Pro 1 750 electric toothbrush is designed to be used with specific Oral-B brush heads, and it is not recommended to use a normal Oral-B Precision brush with this model.

Here are the key points:
- The Pro 1 750 comes with a CrossAction brush head, which is compatible with this model.
- Using other types of brush heads that are not designed for this model could affect the performance and efficiency of the toothbrush.
- It is best to use the brush heads specifically recommended by Oral-B for the Pro 1 750 to ensure optimal cleaning results and to maintain the warranty of the product.