<prompt> Discolouration of the teeth seen in following intakeTetracyclinesChloramphenicolMinocyclineLymecycline  <response>: A Tetracycline 672 - KDT 5th 714-KDT 6th Tetracyclines have chelating property. Calcium- tetracycline chelate gets deposited in developing teeth and bone Given from mid pregnancy to 5 months to extra uterine life the decidous teeth are affected brown discolouration of teeth, more susceptible to carries. Tetracyclines gives between 3 months to 6 years of age affect permanent anterior dentition. Repeated course are more damaging Prevention of discolouration of permanent front teeth requires that tetracyclines be avoided from the last 2months of pregnancy to 4 years and of other teeth to 8 years of age or 12 years if the third molar are valued Prolonged tetracyclines therapy can also stain the finger nails at all ages. 