black mold is revolting [SEP] i got this brush because my dentist recommended it i tend to brush too hard on the corner teeth and was creating notches i was very happy with this for awhile after using it for awhile i started to notice a nasty smell i cleaned the outside of the brush and that did not help next i unscrewed the base from the brush and it was pretty bad in there there was black mold as well as thick white gunk i cleaned it thoroughly with bleach getting into corners with q tips in no time the smell was back this time i investigated further into the brush head itself gaaaaack there was a lot of gross mold growing in there i soaked that in clorox then gave it a shake chunks of mold came flying out i cleaned it as well as i could and reassembled it the brush head no longer workedi change the replacement heads pretty regularly even though they are very expensive i am going back to a regular brush with soft bristles that i can buy for a couple bucks and toss when it gets old