My gum tissue is very loose around my teeth what can be causing it?

Gingivitis: It's probably gingivitis, or inflammation of the gums. See your dentist.

Loose gum tissue: Loosening of the gum tissue around the teeth is usually indicative of a periodontal disease process that should be evaluated to determine the extent of the problem. It might be a very early stage that can be returned to a healthy state with a simple scaling and tooth cleaning process or might require more extensive periodontal treatment.