With their giant handles, these may or may not be mechanical toothbrushes. As you can see, there's a "Boys" and "Girls" design, complete with pink theme and Amy Rose. SoftGrip is not the name of the company, but the type of handle. The photo isn't that close so you can tell well. These Sonic X toothbrushes can be found at Meijers Stores in the USA as of 2007-2008. Meijers is only found in Illinois, Indiana, Michigan, and Ohio.

With Sonic X as popular as it was, as well as the rush on 'electric tooth brushes', someone's thought to combine the 2! So here we have the first (known) battery powered Sonic toothbrush. This features most of the cast of Sonic X on the handle, and some art from the show on the back-card. It is official, it has the Sonic X logo at the bottom and on the card. It looks like it has a start & stop button, and replaceable likely AAA or AA batteries in the handle. Supposedly this is from America, but it is not known where it's sold.
There may be more than 1 design for this.

 Photographed & owned by Blue Sonikku.

These toothbrushes are the 2nd release of the ones above. Still by the same company and still featuring the same characters and boys/girls theme, these differ because the figures on each one are raised rubber. (see the 'feel me' sticker) The bristles for these also contain glitter for added effect! The bristles match the color of the toothbrush. The plastic is somewhat translucent. These were made by WorldTrends INC.