Acceptable quality, but definitely NOT "extra soft" bristles [SEP] There's really only two things that matter when it comes to toothbrush heads:<br /> - fit of the head to the toothbrush base: OK, but a bit loose (and this will wear out)<br /> - quality of the bristles: OK, but these bristles are absolutely not "extra soft"...they don't even rate as "soft"<br /><br />So...as long as you aren't looking for soft bristles, these are fine (and a terrific price)