Our Extreme excel double syringe teeth whitening kits can boost the overall whitening, with astounding results up to 10 shades whiter in half the time of our standard teeth whitening gel. This product will rival any professional teeth whitening in the UK. Join our list of thousands of happy customers; this product up until now has only been available in the USA. Our extreme teeth whitening gel allows for deep whitening below the surface of the tooth to remove the toughest stains and is FDA approved. Get a professional teeth whitening experience at home. Our Extreme teeth whitening gel comes with vitamin E swabs to protect your gums. This double syringe option is perfect for a dramatic boost, giving you a full treatment and a spare for top ups.