Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worth the cost??

I've been buying these for years, almost yearly as the darn tubing keeps breaking off. In the earlier days, there was no replacement hose, so I had to buy a new unit. The newer ones have a replacement handle, but it is not inexpensive either, with the freight to Hawaii.As for getting the job done, it is marvelous. I use a sonic brush, brushing for that 2 minutes, rinse out, then use this unit on my gums, with an ounce of hydrogen peroxide mixed in with a full reservoir of water.Always, always, always, no matter how well I brush, there is debris flushed out. I do have deep pockets and there is probably where the problem lies. However, it beats having to go to a dentist and have him clean out those pockets. I do see my dentist twice yearly, and he still has to get way down there and scrape.It would be much more painful, and longer, without this tool. It's just a shame that the hose has to keep breaking on them. .