I have recently done a tooth fill,a curature,and polishing. I noticed a terrible foul taste from my lower right molar. The area has no sore,no pain,and was recently filled. Althought the molar before it was removed 4 years ago,but the space between has long closed. When i use my tongue to touch the edge of the tooth,it felt as if there was a tiny space around on side of the tooth,and it felt as it something was it in,but the doctors looked at it and said there was nothing there,but i feel it with my tongue and the foul taste is bad,it gives bad breath.