Not really waterproof.
When I first got it, I had no issues - works really well, and had no issues charging. One charge was supposed to last almost a month, but after having it for three days, I started having issues. There is a "cover" that slips over the charging port, making it really easy for water to get in. Water damage happened very quickly because of this, and after three days my toothbrush started to randomly turn on throughout the day. Because of it turning on/off randomly, it dies quickly. I have to order a replacement, but I would say it isn't as "waterproof" as they claim.<br /><br />Edit: Aboht three days after this review, the toothbrush completely died. Waste of money, definitely better options out there.
Rating: 3 stars