hello
discolored or
yellow teeth may be due to variety of reasons including
1.extrinsic factors like excessive intake of tea ,coffee ,smoking , tabacco and also poor
oral hygiene and excessive rubbing of teeth due to which enamel is lost and dentin becomes visible which is yellow in color
2.intrinsic factors like use of fuloride or
tetracycline during
pregnancy or during growing years of teeth
now most of the extrinsic factors can be taken care of by a
dentist who wil do a simple scaling and polishing of your teeth and if you are not satisfied than you can even have a dental bleech done
for intrinsic factors scaling would not be a good choice
bleeching may or may not give good results
laminates have wonderful results
all these procedure would be dome by your dentist
so what i would suggest is that you pay a visit to your dentist who will specify the proper cause and treatment procedure
hope that helps