Instant tooth whitening can be possible by Bleaching, provided u have no hypersensitivity.

There are many methods to make the teeth white and sparkling. Bleaching, Composite restoration , Laminated Veneers, Scaling & Polishing

Consult dentist he will examine your teeth for what type of discoloration is there.some discoloration is extrinsic (that means outside the teeth, due to food, pan,tabacco,,tea,etc) can be removed by scaling and polishing or bleaching.some staining is because of intrinsic cause that'means they are in side your teeth substance, needs special treatment modalities.

Teeth bleaching is the process which is used to 2 shade lighter to the teeth. And more white to the teeth.