Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to clean a ferret's teeth [title] Get a small toothbrush and pet toothpaste. [step] Your local pet supply store will carry toothbrushes designed for kittens and puppies that are small enough for a ferret. It'll also have pet toothpaste, which is safe for a pet to swallow.

Ending1: [title] Create a cleaning solution of hot water and a nonbleach soap. [step] Begin by adding one tablespoon of dish-washing soap to four tablespoons of warm water. Ending2: [substeps] Most ferret toothbrushes have an attachment that latches onto the inside of the toothbrush. These can be easily cleaned by gently rubbing the brush over the bristles. Ending3: Never use human toothpaste to brush a pet's teeth. [substeps] Human toothpaste contains too much fluoride to be safe for ferrets. Ending4: It should be special for your ferret. [substeps] You might want to consider investing in a small toothbrush.

Answer format: ending1/ending2/ending3/ending4