Oh I just love the term "watch". I secretly call this "watch it get bigger". Basically if you don't change your oral hygiene habits these "watches" will probably become a cavity before too long. When a "watch" is placed for a surface inbetween the teeth, we "watch" it get big enough to fill. Our office uses this wonderful laser cavity detector. It's really neat, it can detect the smallest amount of decay starting on the chewing surfaces. I'm afraid to have it used on me, as I'm sure that some decay could be found, I just don't want to hear the bad news. Anyways a small filling is much better than a large filling. So if you have decay, get if fixed, and keep up on your dental appointments so that the dentist can keep watching those teeth, and recommend fillings as needed. Good Luck!