It all starts with plaque. Plaque and tartar buildup on teeth are the main culprits for unhealthy gums. Your gums help to keep your teeth strong. Unhealthy gums are not able to keep your teeth in position and the plaque and tartar buildup cause your gums to recede down making your teeth unstable and move and fall out. So keeping your gums healthy is more important to prevent your teeth from falling out.