at the time oral b and sonicare were the reliable ones and on the market. but there are off-brands ones that are equally as good and cheaper, oral b and sonicare makes thier money off the official replacements heads instead of the actual brush. most people just buy the cheaper replacement knockoffs from amazon.

i never used it like that. i go from the bottom of the top of the tooth to the gumline, just barely. so it doesnt erode the gumlines. i also do it angle where it doesnt touch my gums.

any blood indicates you have gingivitis.