Should a implant when removed have a foul over powering smell?

Had a back molar implant done by a dual certified perio and prosodonti st waited the appropriate amount of time then placed the crown on 2 months ago.i noticed some discomfort when eating I also noticed very slight movement from the crown.when I went to see him once he removed the cement covering the screw and removed the cotton inside there was a over powering foul odor. I asked if it was infected he said no and that it was quite normal to have that smell.is this true?