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Title: What about the batteries?
Review: I have braces and thought this product might be easier than using a "threader" to floss. I think the whitening thing is a bit of a gimmick, but it does a reasonable job of flossing. However, when I tried to open the unit to change the batteries, the head broke off and I can't get it to snap back on--nor can I find the battery compartment. I looked online, and I simply couldn't make any sense of the instructions. Seems like a pretty big design flaw to me.
