Hi I can't believe I missed your thread, first of all I want to give you a great big welcome to Yorkietalk! Around the age of 6 months many yorkies will lose their baby teeth, they often have a problem losing all of them, and most of us have to get some pulled during a spay or neuter. Some people recommend chewing toys to get them to lose the teeth on their own. This is also a good time to start a tooth brushing routine. They are getting their permanent teeth and since yorkies are prone to tartar, dental care is very important. You can find toothpaste especially made for dogs with a flavor that appeals to them. At first they won't like it, but in time they fight less. Start with short sessions.
It's been so long since you posted, I wondered how he's doing now?