Not for my dog.
The brush handle is mildly flexible and seems to be of decent construction,  That being said, it is the only good thing about it.  I have tried three of these (a new one each time I have brushed my dog's teeth) and found them to be junk.  The bristles are not durable in any sense of the word.  After one use they are either curled all over the place (looks like if you used your own toothbrush one month too many) or the bristles come loose, not sure why or how, but it makes it look patchy and spotty.  In either case it is not something I want near my dog.  I threw the rest away and will not buy them again.
Rating: 1 stars