4 X Colgate Sensitive Pro-relief Complete Protect Toothpaste 110g Colgate Sensitive Pro-Relief Whitening Toothpaste gives you the freedom to forget about tooth sensitivity. It contains clinically proven Pro-Argin technology which provides instant and lasting sensitivity relief. Colgate Sensitive Pro-Relief works by plugging the channels to block tooth sensitivity and with regular use, it builds a long-lasting protective barrier that acts like a seal against sensitivity. For instant relief, just apply directly to the sensitive tooth with finger tip and gently massage for one minute.