Truth: Tooth washing is to remove bacteria, calculus and pigment. There is a gingival sulcus of 0.5 mm to 2 mm between gum and root surface. Food residue is easy to accumulate in gingival sulcus, which becomes a suitable area for bacteria growth and reproduction. As time goes on, these plaques accumulate and become dental calculus. Dental calculus will continue to "eat away" the gums, leading to inflammation and atrophy of the gums, and eventually lead to tooth loss.
When these calculus are removed by tooth washing, the roots are exposed again, and the teeth will become sensitive. As for the bigger teeth and loose teeth, it may indicate that the gums have begun to shrink.