Teeth crowding occurs when there is simply a lack of room within your jaw for all of your teeth to fit normally. When left untreated, overly crowded teeth can get worse over time, and result in severely crooked teeth. This crowding can lead to plaque accumulation, tooth decay and an increased chance of gum disease.Swollen, red gums can often be the result of having teeth that are crowded or too widely spaced. Unfortunately, these are also signs of periodontal disease. When teeth are properly aligned, it helps the gums fit more securely around the teeth, allowing for the strongest and healthiest defense against potential periodontal problems. That’s where Invisalign comes in. The comfortable and clear aligners gently and gradually begin to move your teeth into the proper position — without unsightly brackets and wires.