Tonsil stones are small, calcified formations that occur within the crevices of the tonsils. Composed of hardened minerals or food particles, these growths are generally harmless but can cause unpleasant symptoms such as bad breath or sore throat. Tonsil stones typically appear as small, white or yellowish pebbles on the tonsils. In most cases, they can be removed at home, although surgical intervention may be necessary if they persist or cause discomfort.