How To Know You Got A Cavity. Since cavities are holes in teeth, having visible holes or pits in your teeth is a sure sign that you have a cavity. Here are some of the most common signs you may have a cavity.
If it was built more recently, chances are it has cavity walls. If your wall has a regular pattern like this then your home is more than likely to have cavity walls. In that case, take a look at the thickness of your exterior walls.
If your home has solid walls, then the brick pattern is likely to look like this.
At that stage, the cavity will be impossible to ignore. If your walls are more than 260mm thick (approx. 10 inches), it is likely that they are cavity walls. Pain on biting down may indicate an abscess or a cracked tooth due to the decay.