A free trial programme for Tartar Control Listerine is running in major retailers until the end of the year. Borrowing the brand’s ad strapline Fight the tooth fairy’, consumers are encouraged to buy a 250ml bottle of the antiseptic mouthwash through a message on its neck collar and then reclaim some of their money by using a £1 voucher against the larger 500ml size. To qualify they must send off the collar and answer four questions. {{P&P }}