Over the Counter Teeth Whitening Kit:

Teeth whitening products in drugstore use the same materials as medical whitening except with lower concentrations. These treatments are recommended for the non-smoking patients with relatively white teeth. They might be the cheapest treatments but not the most effective ones.

Teeth Whitening by individual trays (dentist):

Personalized individual trays, allowing a more secure and efficient application of the hydrogen peroxide gel with concentrations ranging from 9% to 22%. Intended to non-smoking patients. Only available for the smokers if they withhold smoking for the treatment period. Generally, we notice great results. These treatments are more expensive than those in drugstores. The choice of the therapy relies on the starting shade of the teeth rather than the cost of the treatment, since each treatment responds to a different degree of efficiency.

Clinical Teeth Whitening (laser):

Clinical teeth whitening have the same efficiency as the trays method. The difference rely on duration of the treatment: 2 hours instead of 2 weeks. Appropriate for smokers, for those in a hurry, for those who do not have the patience for the 2 weeks of treatment with individual trays.