<s>[INST] hi, im awaiting a dental appointment in two weeks to get plaque removed from back of my bottom teeth (very bad, never had it done before and im 26)!However my teeth are quite overcrowd at bottom so i feel them pressing against each other and my mouth in general feels sore and dry? [/INST] Dear user, Thanks for using Chat Doctor, Dental plaque is a biofilm, that contain microorganisms, So many causes of place (like overcrowded teeth, brushing techniques, type of food intake etc.)Plaque cause gingivitis and periodontitis, and responsible to halitosis (bed breathing)Also cause the calculus of teeth, You should use mouthwash (chlorhexidine) and scaling your teeth, and brush your teeth twice a day properly, For overcrowding you should take or tho treatment, So you should visit a dentist for scaling and or tho treatment. I hope I answered your query. If you have more questions I will be happy to help. Thanks and regards </s>