<s>[INST] hithis amar my tooth is looking like a yellow colour and also gap between tooths wht to do can u pl help me ......... [/INST] Teeth with yellow color are usually due to "PLAQUE" collection on the surface of the tooth. At times, you can remove this plaque by using proper "Brushing Technique" But at times when your brushing technique is not proper, this plaque get accumulated on the tooth and gets hardened at times and get converted into hard mass, called "Calculus". So for removal of such yellowish discolorations and collection of plaque or calculus, you can consult your dentist and can ask for "Scaling" treatment, they will clean your teeth with Ultrasonic Scales. Regarding Gap [spacing] between teeth, it's a common problem and can be corrected easily with "Orthodontic therapy".they will put braces [brackets/ wire] and will align your teeth to be in good shape. Regards:  </s>