I think most people are getting savvy to the customer reviews these days on the sites of retailers but if you’re still naive to it, here’s an example.
Uber Sonic isn’t the answer to your dental woes.
Basically you get a cheap (and from the reviews ‘cheap’ appears to be accurate in all respects) sonic toothbrush for £19 and then new brush heads monthly (bear in mind that monthly replacements are way to regular). And all for just £54 a year.
If you then look at the Uber Sonic Facebook page, a response to the first post stands out.