Soothe Desensitizer 4 x 1.2 mL Syringes & Tips. 6% potassium nitrate and 0.1% fluoride gel. Relieves tooth sensitivity caused by chemical and thermal changes. Unlike other desensitisers, Soothe will not interfere with the whitening process. Kit: 4 - 1.2 mL Syringe and 4 Tips. 4 - 1.2 ml syringes