Oxygen Mask 
Wearing an oxygen mask in a dream indicates that you need protection from outside influence. You may be concerned that your environment is causing you pain.
Alternatively, an oxygen mask may symbolize a need for freedom. You need to get out of a stifling atmosphere and express yourself.
Lie Detector
A lie detector in a dream represents a test which you are trying to pass. You may have a secret which is bothering you and you are afraid of being caught. You may also have a big interview ahead, or a final exam, which is causing you stress.
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