The sodium perborate gels supplied by WhiteTeethWhiteningKits come in a large 10ml syringe, this is enough for 10 treatments. The gels are available to purchase in numerous quantities from 2 to 10, should you require to purchase more than 10 then give them a call. Their gels are used by many teeth whitening technicians not only in the UK but worlwide. They achieve excellent whitening results!