Hi,
I also have this to a degree,, as Tod says mine is just slightly closed or more narrow than "good" side,, I don't notice it much and it only really bothers me while sleeping,, I have learned to compensate at night by gently holding cheek back with hand while I sleep,,it's hard to explain,,
.. I have facial paralysis due to severed facial nerve during 2011 translab surgery so I attribute this to a lack of muscle tone on that side, much like my eyebrow does not lift above my right eye and my mouth does not open correctly,, I really don't believe anyone else notices this,, and I don't think about it honestly,,,
Tod,, one thing I did recently to help the eye "winking"during chewing is to have Botox shots in eyelid area,,, didn't think I wanted to do,it,, but it's been a little over 2 weeks now and it is SO much better! Not really noticeable any more,,, of course,, this will wear off and have to be repeated in about 3 mos. but if it lasts like this for awhile, I may just do it again,,,, one less aggravation,,
Good luck to you, but I agree, if this is not bothering your breathing,, I would not worry about it,,
Jane