Dear user, Thanks for using healthcaremagic, Dental plaque is a biofilm, that contain microorganisms, So many causes of plaqe (like overcrowded teeth, brushing techniques, type of food intake etc) Plaque cause gingivitis and periodontitis, and responsible to helitosis (bed breathing) Also cause the calculs of teeth, You should use mouthwash (chlorhexidine) and scaling your teeth,and brush your teeth twise a day properly, For overcrowding you should take ortho treatment, So you should visit a dentist for scaling and ortho treatment. I hope I answered your query. If you have more questions I will be happy to help. Thanks and regards