Quick answer: Tonsil stones are small white or yellow lumps of trapped debris and bacteria that harden in the folds of the tonsils. They can cause bad breath, a sore throat or a feeling that something is stuck. Gargling salt water, staying hydrated, and brushing, flossing and cleaning your tongue help. Large or frequent stones should be checked by a doctor. Have you ever seen white-ish or yellow-ish lumps that look like they are embedded in the back of your throat? These are