Man, I don't know. I don't remember having dropped any of the horn combs I owned, neither did I take any special care to protect them from falling, contrary to, say, glassware.

And I've never seen any testing done on horn combs, by consumer organisations, in order to assess how they would resist to falls. Neither have I read any advice to the effect of not letting them fall, despite having read quite a lot of recommendations on sites of manufacturers of such products.

For instance, they would advise you not to expose them to excessive heat, nor to leave them for too long in water. They would also tell you not to put them in your back pocket, because if you sat on them, yes, they might break.

As for hotels, one artisan maker advised customers not to leave their combs in plain sight, because they might be stolen (referring to an actual event)... but he did not mention maids letting them drop.