SO
Sonic Dental
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Trustworthy Company
The Sonic Spa is definitely easier than than brushing your retainer (Invisalign in my case), but I'm not convinced that it is any better than my electric toothbrush, except for perhaps the UV disinfectant properties, which in fairness, is a bit of a concern. Having said that, they have a 100 day money back, hassel free guarantee, and after some confusion (I have a common name and got mixed up with someone else), my return experience really was hassel free and the contact at the company was courteous and patient in dealing with me. I would recommend the company for sure.