This upper right canine was in cross bite. It’s when a tooth doesn’t overlap/ interdigitate with the opposing tooth. They can make the tooth (for example in this case) seem missing and darker. If left they can cause further problems of over erupting teeth, tilting teeth and problems with your bite
It is important for children to maintain good oral hygiene, even at a young age. Here are a few tips on how to brush children’s teeth and some advice on which toothbrush / toothpaste is recommended for you child.