Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Zeno

Not sure if it really worked. It looks like it's working at first, and then an hour later after treating I did not notice any reduction in pimple size. Would not recommend unless you have one or two pimples or less per week-- otherwise this can be REALLY expensive to try to keep up on because of replacing cartridges. My acne is moderate, and I have had it for over 10 yrs. Hope this helps! :)