This is a review of the Radius Big Brush, in two parts, the first part general and the second part specifically addressed to people with hand tremors, in particular people with essential tremor.
1. I've been using the Radius Big Brush for many years. I find it exceptionally satisfying, in that it gives the gums a pleasant massage, and the bristles have just the right degree of yield.
2. For people like myself, who have so-called essential tremor, or I would think any type of hand tremor, the Radius Big Brush design is uniquely valuable. I have had essential tremor since childhood (yes, that's possible), and this brush design has solved problems with toothbrushing that I had for much of my life: it greatly reduces the need for precision in placing the brush so as to brush the gum line, and it eliminates the rigid part of the brush knocking into the teeth.
A supplementary remark for anyone who works in a hospital: because the Radius Big Brush Is so helpful for people with hand tremors, I regard it as being a prosthetic for people with this problem, and I think any hospital would be well advised to carry a stock of Radius Big Brushes, so as to be able to give one to any patient with hand tremors who is not already aware of this product.
Please note that these remarks apply specifically to the Radius Big Brush, not to the Radius product with the small brush head; the small brush head is not especially helpful for people with tremors.