I'd also say go for it. Being a smaller dog, he will be more prone to yucky teeth and gingivitis. I recently had my Chihuahua mix's and my Dane's teeth cleaned. This was Choo-Choo's, the Chi mix, second dental in about 6 months. Her fourth in 3 or 4 years. She just naturally has bad teeth, but I'm trying even harder than ever to keep them clean now because I really don't want to have to put her under again.
I probably won't have to do Brutus' teeth again because he will let me scrape them w/out anesthisa, but they had gotten past the yucky point because I was slacking on my part.
Dental hygene is just as important for pets as it is for people. If left alone, tarter leads to gengivitis which can lead to infection. Nasty bacteria can cause septicemia which can lead to organ damage.
After the dental, it is important to keep the teeth as clean as possible to avoid having to do another (I need to practice what I preach
) by regular brushing, and allowing the dog to chew on safe items such as raw recreational bones, compressed
rawhides, or pizzles.