###Human: What is the best treatment for gum bleeding and bad breath? ###Assistant: Hi. I can understand the problem. It is called lower jaw insufficiency and it is an orthodontic problem with crowding in lower front teeth. The yellow layer is called dental calculus and it is a calcified dirt. I would suggest you undergo orthodontic treatment. The dentist may extract one or two teeth as a part of treatment after a thorough examination. He shall align the teeth properly in a year duration. Also, undergo scaling and polishing of your teeth at the earliest.