Cold sores are a painful annoyance. Good thing clera is here to save the day with our powerful and patented stannous fluoride formula that inhibits the cold sore virus from replicating. It heals cold sores fast, and even prevents cold sores from flaring up when applied at first tingle! product information is provided by the product vendor. This content is a summary for informational purposes only and does not have all possible information about this product. It should not be used as a substitute for advice from health care professionals, as this information alone does not assure that this product is safe, effective, or appropriate for you. For more detailed information on this product, including reported and possible side effects and contraindications, refer to the manufacturer’s monograph, or speak with a health care provider.