All permanent teeth are slightly off-white. Some have darker teeth due to intrinsic discolouration – defects in tooth formation or from taking certain medication when young. Extrinsic discolourations, due to consumption of food and drinks like coffee and tea, can also be deposited on the surface of the teeth.
Professional teeth whitening can help in most situations. In general, off-the-counter whitening toothpastes are not as effective as professional whitening but they are helpful in maintaining the colour stability of your teeth after professional whitening.