You are too young to get yellowing of teeth... there has to be a reason why its happening...bcs thin enamel, eating habits etc...sincere advice to visit dentist and get your check up done and scaling done..there is no such medicine to get your teeth whitened. Thank you

What is the reason for sudden yellowing, you may have deposits on your teeth if your maintenance hasn't been up to the mark. These deposits calcify in 14 days and are not removed with regular brush. A professional cleaning called scaling procedure done by dentist is needed in such cases. The colour of teeth is constant just like you skin hair and eyes, if you want to cosmetically change it u can do Bleaching procedure done at the dental clinic. Home remedies like rubbing banana peel, baking powder can help remove mild tea and coffee strains.

If there are yellowish deposits or stains on the teeth, they can removed by scaling and polishing by a dentist. The cause of yellowness has to be understood by the dentist, which can be done only after a check up. If there are no external stains, it might be due to thinning of external layer (enamel). So, in that case, the line of treatment shall be different.