This True White Advance Plus Whitening System for 2, originally $199.99, is now $14.99 at Tanga. Plus, shipping is free making this the lowest price we found for this by at least $13. This system includes 2 syringes, 2 sets of mouth trays, and a blue LED accelerator light. It uses the same enamel-safe and dental-grade formula used by leading professional dentists. This set is good for 20-25 dental quality treatments. Sales tax is not charged in most states.