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Teeth whitening strips are popular with people looking for an economical and convenient way to give their teeth a brighter, whiter appearance. Professional teeth whitening by a dentist can cost more than $1,000. However, you can purchase a full supply of teeth whitening strips over the counter at pharmacies and other retail stores for $20 to $40. Some people also find teeth whitening strips easier to use than tray-based teeth whitening systems, which are the other major option for whitening your teeth at home. The trays require you to apply whitening gel to a tooth tray, which you press against your teeth and wear for several hours. Teeth whitening strips are pre-coated with gel and are only worn for 15 or 30 minutes at a time.