Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to keep your dog's breath fresh [title] Get the right equipment. [step] The most effective method for keeping your dog's teeth healthy and breath fresh is brushing its teeth as often as possible. Before you can brush your dog's teeth, you need appropriate supplies.

Ending1: Choose dog-friendly products from the pet store or your veterinarian. [substeps] Human toothpastes are not suitable for dogs because they are not safe to swallow in large amounts. Ending2: Some amenities may include : [substeps] A wooden brush. This device has a long arm and a pointed part that clips onto the sides of the mouth. Ending3: You should have a handheld-not electric-bristled brush for the best results. If your dog is suffering from dry, irritated teeth, consider using an electric toothbrush. Ending4: To keep your dog's teeth fresh and clean : [substeps] Brush your dog's teeth with nylon-bristled brush floss dental floss. The floss is so small, it may not be able to stretch all the way across your dog's mouth.

Answer format: ending1/ending2/ending3/ending4