DO NOT USE HUMAN TOOTHPASTE to brush your dog’s teeth! The chemicals in human toothpaste are made for humans and will upset your dog’s stomach and possibly worse! Please use a pet toothpaste, which is made to not harm the dog.
Also, you need to brush their teeth more than just once. Have you just brushed your teeth once since you have had teeth? I doubt it. Your dog’s teeth are the same way. They need the constant care that we give our own teeth to avoid major health issues.