Dear Margaret,  I was given the brush by the oncological dental folks at my cancer center and I used it until the bristles started falling out and choking me.  I looked all over trying to find them and finally went back and begged two more.  I recommend them totally.  I tried using a baby brush but it is too little.  Commercial brushes labeled soft feel like scrubbers--impossibly harsh.  After I got through the whole radiaition thing the hygienist complimented my tooth hygiene, all of which I attribute to this wonderful soft brush.  These are the tricks of this trade, I guess.
Hope this helps and hope your husband is doing well.  Thanks for the website, I will check it out.
Best wishes,
Bonnie