Looseness usually occurs when a tooth loses support and gradually detaches from the bone and surrounding gums, causing it to move due to friction from either touching or eating (via Healthline).
If accompanied by other symptoms, such as bleeding or swollen gums, gum recession, or very red gums, the looseness could indicate an underlying issue and you should contact your dentist or doctor immediately. In certain cases, it might even be due to advanced gum disease, which is heralded by a bacterial infection in the gums, tissue, and surrounding bones.
Thankfully, gum disease is treatable, particularly if caught early, but it's worth noting it occurs most often as a result of bad dental hygiene. You should always ensure you brush and floss regularly, as well as keeping up with regular dental cleanings, to prevent tartar buildup. If left untreated, gum disease can lead to bone deterioration and even tooth loss, so it's a major concern.
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