Sore mouth symptoms do not improve in 7 days. Irritation, pain or redness persists or worsens. Swelling, rash or fever develops. Cough lasts more than 7 days, comes back, or occurs with fever, or persistent headache. These could be signs of a serious condition. If pregnant or breast-feeding, ask a health professional before use. Keep out of reach of children. In case of overdose, get medical help or contact a poison control center right away.