Stones are generally associated with kidneys and gall bladder when referred to in the context of diseases and conditions. But they can affect your tonsils too the gland-like structures at the back of your throat that protect you against the viruses and bacteria that cross your throat. However very few people know about tonsil stones though they affect many. In this condition also known as tonsilloliths debris and bacteria build up in the crypts (crevices tunnels and pits) of your tonsils. They harden or calcify with time and turn into stones. The debris can be white or yellow in colour.