What is the cause of tooth yellowing?

  There are two main reasons for jaundice: exogenous and endogenous jaundice. 1. Exogenous yellow teeth: Because food pigments stick to the teeth, they are yellow or gray; smoking soot, beverage, coffee, tea pigments stick to the teeth are yellow-gray. 2. Endogenous yellow teeth: teeth are affected by certain elements. Pigments are not on the…

How to brush your teeth correctly?

The specific steps are as follows: 1. Place the toothbrush at the junction of the crown and gingiva (red-white junction). The bristles of the toothbrush are 45 degrees with the teeth facing the gingiva or deep into the gingival sulcus (maxillary teeth up, mandibular teeth down). 2. Under gentle pressure, the horizontal direction of in…