Proper maintenance of the teeth by the patient is more than sufficient. If the source is moderate to severe in collection then professional help is required. Serious systemic problems might have to be treated to correct bleeding from these diseases. Yes, bleeding gums is a serious problem. It is either indicating the beginning of the destructive process involving the supporting tissue around the tooth or some serious underlying systemic problems, which could be fatal.
Liquid solutions are available across the counter, which can be self administered by patient.
When applied over the gums it either stops or reduces bleeding. But ultimate result is obtained by treating the cause. Proper care of the teeth and its associated structures. It is a rapidly spreading destructing disease of the gum.