Work through the entire coat, the dense pins of the slicker will break apart mats as you brush.

Use a small, high quality slicker brush and use it to brush towards the growth of the coat, not against it. Work through the entire coat, the dense pins of the slicker will break apart mats as you brush. If the mats are still too thick or causing pain, you have reached the point of no return. Ask your groomer to shave out the matted area or simple have them do a kennel cut / shave down. If you’re having difficulty getting through some mats, try bathing your dog and applying a dematting conditioner directly to the ​tangled area, and letting it stand for 5 minutes

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https://www.playbarkrun.com/yorkie-coat-facts-care-grooming-cuts/