There is no significant effect if the filling is ground down a little, but grinding it too low will affect the chewing efficiency or cause food blockage, etc. The details are as follows.
There is physiological wear and tear of human teeth, so if a filling is slightly worn down, it will not have any special effect as long as the bite of the upper and lower teeth is still normal.
However, when the filling is worn too low, the tooth and the teeth of the opposite jaw can not be fully contacted, grinding and chewing food, which will affect the efficiency of chewing, and in serious cases, the digestive system will be affected.
If the filling is ground too low resulting in the loss of physiological neighboring contact area between the filled tooth and the adjacent teeth, it will lead to food impaction, and over time, the filled tooth and the adjacent teeth will be decayed.
If a filling is worn too low, or if other symptoms appear, it is recommended that you visit a hospital promptly.