One session lasts three to four months. Chewing strength drops within two or three weeks, but a visible change in the face line takes two to three months, because the muscle shrinks only while it goes unused. With repeat sessions the smaller state holds longer, and the interval is often widened.

Chewing may feel weaker for the first two or three weeks. Avoid hard foods for a while and ordinary meals are unaffected. It does not remove the muscle, only reduces how much force it exerts, so strength returns with time while the reduced size remains. If you often eat tough foods, mention it beforehand.

The drop in chewing strength takes two or three weeks; narrowing of the face takes two to three months. Nothing is shaved from the bone — the muscle simply shrinks as it goes unused, so change appears slowly. That is why photos taken right after tell you little, and comparing after two or three months is more accurate.