Good fit on finger, seems not to be discomfortable!!
I have 4 dogs that weigh between 7 and 10 pounds.  Two of them hate having their teeth brushed, one tolerates it, and one likes it.  With these brushes my dogs have been pretty easy to handle and don't seem to be discomfortable during the process.  They are super easy and snug on the finger with multiple sides to utilize in brushing easily!
Rating: 5 stars