Is it true that teething causes a runny and/or blocked nose? my 6 month old girl has been teething since she was 3 months but no teeth yet and she's had a runny/blocked up nose for about 6 weeks now, we're using a thing to suck out the snot, we're also using "snuffle baby" and "karvol" the creche says its just teething but i'm not sure, its really starting to bother her!!