FAQs Why do teeth become discoloured? December 20, 20170 Comments079Views Q. Why do teeth become discoloured? A. They can be discoloured due to smoking, drugs and due to ageing. If the tooth dies, it becomes impacted wisdom tooth. NOTE: Kindly consult with doctor before attempting any of the home cures.You may be interested in:What is the right way to brush our teeth?Why do we have problems when wisdom tooth emerges?Why is it named ‘wisdom teeth’?How many teeth should an adult have?Why does toothache take place?How many types of teeth do we have?How to Cure Staining of Teeth and Lip Shading Naturally?How to Get Rid of Toothache at Home Naturally?Cure Pyorrhoea with HomeopathyHow to Cure Gingivitis at Home Naturally?