I'm in the same dilema right now, i can see plaque in Mojo's back teeth but the vet wants to wait longer, since it is barely there and to put him under right now it is not worth. Mojo is 2 1/2 and that would be his first cleaning...i am very concerned, at the same time i don;t want to leave his teeth with plaque, i cannot think putting my boy under every 2 years for a teeth cleaning...