"A novel toy that likely fails at its primary job: cleaning teeth."
The '360° Sonic Automatic Cleaning' uses a vibrating silicone tray to jiggle all teeth at once, a method far less effective than the targeted bristle movement of a conventional electric toothbrush for removing plaque.
This could be considered for a child who absolutely refuses any other form of brushing, where using this is better than doing nothing at all. It may serve as a short-term novelty to introduce the idea of oral hygiene before switching to a real toothbrush.
Parents seeking effective dental care for their child should skip this. For the same price, entry-level electric toothbrushes from reputable brands offer proven, ADA-accepted cleaning technology and a reliable supply chain for replacement heads.