Without seeing The x-rays, it's hard to make a definitive diagnosis. With that said, you have a tartar built up around your teeth and under your gums. The tartar Causes the gums to become inflamed and start to recede. Behind the lower front teeth is a classic spot for this to occur, as you have a salivary duct there. You also have some crowding there, creating nooks and crannies for the tartar to build up in. The tongue and the lip sweep over the tooth surfaces and help to keep them clean. With the crowding, they don't get into overlapped spots. go see the dental team as they will help you to keep your teeth. The hygienist cleans off all the tartar buildup it shows you how to take care of your teeth at home. on the front of the lower teeth, you have a piece of tissue connecting from your lip into the gums around your teeth. That tissue is pulling your gums down, helping to create more recession. that connection can be lasered away, and the pulling will stop. This is called a frenectomy. The crowding and overlapped teeth can be corrected with orthodontic treatment such as Invisalign.best of luck to you!