Philips Support
How do I place my brush head in the traveling case?
When opening the travel case, first place the brush head in the case (see image). The traveling case provides hygienic protection for travel.
Note: Adding the brush head cap to the brush head will not allow the brush to fit properly.
Once the brush head is in the travel case, you then can place the brush handle in the travel case (see image).

The information on this page applies to the following models: HX9990/11 , HX9990/12 , HX9990/13 .