Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointing ...

For me, did not work as described. May be some transient/temporary pain relief (for an hour or two), but you have to balance that temporary respite against the additional discomfort you'll have in putting it on, and in trying to talk/eat, etc. for the 30-40 minutes after you put it on (when the patch is very bulky & awkward). Definitely does not heal ulcers (canker sores) any more quickly than they would heal on their own. If makers of over-the-counter products were held accountable for their claims (i.e., by the FDA, which unfortunately does not regulate OTC products), this claim would be shot down right away. I cannot recommend this product. As for the "positive" reviews, I have to question their legitimacy (or at least that they are all legitimate customers with a positive experience).