Loosen teeth, retract the gums, bad breath and bad taste in mouth.

If the gum is inflamed by accumulation of plaque and this is not a time, begins a loss of bone that holds teeth, as it loses more fabric support these are becoming loose over until fall. 
There are different causes. One of them may be an improper brushing or use a brush too hard, which mistreats the gums and causes it to retract, another cause may be a malocclusion (Dental appositions) in which the presence of very heavy and unstable contacts between the teeth colossal trauma occurs, which in turn destroys the enamel generating an abrasion.
Bad breath is termed as halitosis and may be due to periodontal disease where there is an inflammation of the gums, bleeding, or if more serious exudates (pus), may also be related to gastric problem, as is the reflux of acid from the stomach. In general plaque that generate waste not being properly removed decompose to produce a bad taste in the mouth.