The cost of teeth whitening varies according on the technique, ranging from reasonably priced at-home kits to expert procedures. Depending on the facility and technology, in-office whitening operations can cost anywhere from $300 to $1,000, while over-the-counter remedies usually cost between $20 and $100. Additionally, several dental practices sell take-home trays for between $200 and $400. Costs may also vary depending on the intended outcome and staining intensity. Always seek advice from a dentist to determine the safest and most efficient teeth-whitening procedure for you.