I have an problem with my teeth like, black line stain in front of the teeth, so it looks very awkward, so could you please advice me to get rid of it??
Get a professional cleaning done. If the stains are extrinsic they will be removed. Avoid too much tea , coffee ,colas to prevent them from building up again.
However if the stains are intrinsic or deep you may have to go for teeth whitening.