<s>[INST] I have woken up this morning and found that when I look at the bottom row of teeth, along the gum line, the gum goes down towards my jaw, making a big dent in where the gum line should be. Any ideas on what could have caused this and how to fix it?thanks [/INST] Hello, Thanks for your query.Periodontal disease is the infection of the gums, and it gradually destroys the support system for your teeth. Dental plaque is the primary cause of gum disease. Bacteria inside plaque creates toxins, which irritate the gum tissue. Irritated gums may swell and bleed. If the irritation continues for too long, the gums separate from the teeth, causing spaces to form.I do hope that you have found something helpful and I will be glad to answer any further query.Take care </s>