I've had upper front teeth numbness from allergies (supposedly, but that was before they realized I had MS), from sinus pressure in my cheeks. I wouldn't think lower mouth numbness could be caused by allergies though.

I've had full mouth numbness (lips, tongue, roof of my mouth, teeth, etc.), and facial numbness/tingling from the MS too. When I had the mouth numbness, it started in the roof of my mouth (I think ), and over several days expanded to the other areas.

If nothing else "new" is going on, I'd just wait it out. If it doesn't change much . . . then you have nothing to be too concerned about. If it does expand to include most of your mouth (throat, lips, etc.), then you know it's the MS. Even then, not much can be done about it . . . unless it becomes terribly difficult to contend with (swallowing, etc.).

Cherie