Just treat him for a few days every time you show him the toothbrush a few times each day. In a few days, gently and quickly touch it to his mouth and remove it, treating him quickly and getting up and letting him go his way. Repeat this a few times a day - just a touch on the mouth and a treat and it's over. In time, you can wrap him in a towel to secure him and gently open his mouth and touch the brush to a tooth, then unwrap him quickly and treat him, let him go. Repeat, repeat, repeat - keeping each session all very upbeat and frequently repeating them often during the day or evening and weekends. In time, brush a tooth or two, then unwrap the dog, treat him and let him go. Keep repeating these sessions, keep them very short and slowly work up to the dog allowing you to brush one whole side of his mouth, then both uppers and then adding sections of the lower teeth until you've gotten through the whole mouth.
In time your dog will become desensitized gradually to the process and grow to accept it as a part of his daily life and you will forever be grateful that you took the time to teach him how to accept toothbrushing as it will keep his teeth and breath fresh.
Don't forget to have the vet check your dogs teeth and gums twice yearly as Yorkies need the expertise of a professional to assess their dental health and tell you when it's time for a professional cleaning.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |