First of all I was tired of spending too much money on a sonic/ electric toothbrush. And my husband and I don’t share an electric toothbrush any more because cold and flu season is here and I don’t think it’s sanitary. All that being said , the reviews I read on this Particular toothbrush were very good and the 18$ price tag was just perfect. I’ve been using it for almost a month on one charge and no change noted in the strength of its power! I love that it has 4 cleaning modes and how light it’s in my hand . I intend to use it until it stops so I can see just how long it holds a charge . I’d advise the purchase of extra brush heads immediately because that’s the only negative comment i noted as important. For those of you who are interested if the toothbrush is gentle enough for sensitive gums or teeth, the answer is yes .