THE REFERENCE SHELF
Heads & fit
Philips compact head: keep HX6032/94 attached
The model suffix, age statement and selling quantity are part of the selected refill.
Oral-B families: do not collapse iO into every refill
Read the handle family and actual manufacturer fit information.
A travel case must fit the actual brush
A case’s external length is not necessarily its usable internal space.
Keep the full handle and refill numbers
A missing suffix can hide a different pack, market or revision.