Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great flosser - for some of your teeth!

Since Oral-B killed the excellent Hummingbird flosser (why??) I have been on the lookout for an alternative. This looked good on paper, so I decided to give it a try. For me, this has turned out to be useless. First of all, the angle is such that you cannot reach the back teeth at all without contortion. Also, unless you have wide even gaps between the teeth, this does not go in. So, I can floss about 50% of my teeth with this thing. There is an old joke in dentistry "You don't have to floss ALL your teeth everyday - just the ones you want to keep". So, this is a great flosser for people that don't want to keep all their teeth (unless you happen to have nice even large gaps between all your teeth). I wish I could return it, but since I have used it in my mouth, I doubt they will take it back. Good thing it is not too expensive.