It shouldn't hurt at all, however, if it's a deep cavity, they might blow air into the cavity and ask you if it hurts. That's just probably to see that they won't be filling in a plaque filled cavity.
All they really do is fill it with a substance and let it dry. Simple and Painless really.
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it stops the air circulating
Cavity walls are made up of an outer wall (ie brick) and studs or concrete blocks inner supporting wall. The cavity in between (usually a minimum of an inch) is a space for air circulation and also to keep rain from getting to the outside surface of the inner wall.
my cavity was getting worse every day.
When the diaphragm relaxes, the volume of the thoracic cavity decreases. The resultant decrease in thoracic cavity leads to an increase in the pressure. This increase in pressure leads to the exhalation of air out of the lungs into the atmosphere.
They work by sucking up dirt and debri, usually from the home and transported to elsewhere, for example a garage, through tubing in the wall cavity's. It is run by connecting to the mains and is useful as it saves dragging a heavy vacuum cleaner around.