Dental implant smells bad - is this normal?

I am 65 160 pounds in good health. I went to my dentist because a tooth number 18 was moving. The doctor said come in he would pop the tooth off and tighten the implant then put the tooth back on. When he removed it . There was a really back smell. When I asked him about the smell he said the was normal. Is it ? I brush and use mouth wash two times a day.