Product name site:.org
Sample search: Sonicare toothbrush site:.org
Device name site:.gov
Sample search: Glide floss site:.gov
The Who Cares principle is extremely useful when trying to find information - think of Who Cares about this topic??? For the most part it will be various professional organizations, which ideally you found information from doing your Google search with the domain restricted to organizations - .org.
See the Trusted Health Information Sources listed in the Consumer Dental Products tab, but for devices you may also want to try the following: