My inclination is to say that any symptom following a single drop of activated Miracle-Mineral-Supplement in a glass of water isn't very likely. Though, I'd be interested in hearing if the condition persisted over the course of intermittent trials. (5 days off type of thing).
As for jaw pain, there's always the possibility of interactions between Miracle-Mineral-Supplement and underlying conditions as well as the potential for irritation as the acid component could irritate an existing lesion in a tooth etc. - tough to say without additional information however; amounts, solution type, application etc.