Mine have sardines or pilchards in tomato sauce as a full meal once a week and have a bit of the tomato sauce but not all. The sauce has salt in it and tomatoes are very acidic, so not good for teeth. I may be worrying too much about that but William doesn't have very good teeth (don't know why) and will be having a couple extracted very soon, so I try not to give him things that might weaken his teeth further.