not firm very small head end gets moldy [SEP] short versioni ordered this since they advertised that it was not a soft bristle but firm medium this toothbrush was made with unicorn hair super soft and just silly years ago once i started using firm toothbrushes properly i have only light plaque at each months dental cleaning and have not had any cavitieswhen i received them i noticed the head is not adult i do not care what these other reviewers say and they had to have been paid off because i have a small mouth and this size was just stupid i was willing to try it and as i used it it was like the unicorn hair got softer and softer i compared it to my firm toothbrush it was replacing and i am sorry no comparison i like clean teeth which is obtained in a short time with a firm brush if i wanted to spend minutes brushing my teeth i would just use the toothbrush the dentist gave mei was going to go to the store and get more but i saw the bamboo handle and thought wow that is earth friendly well mold is earthy too so if you still want these soft bristled brushes for infants teeth make sure you hang them and do not set them in a cup where the mold will grow from the water that drips down