Can I take my shaving mirror on a plane?
Most shaving mirrors are compact and designed for travel, there shouldn’t be a problem if you take them with you on a plane.
Mirrors, in general, are allowed on a plane as long as it fits in your carry-on luggage, if larger, it should be checked in.
The final decision rests with the TSA officer on whether an item is allowed through the checkpoint. Different airlines have different policies on allowed and prohibited items. It would be best to check with the airline first before you travel.
Source: List of allowed/prohibited items