Why I feel uncomfortable when use toothbrush?

Solution:

The vibration frequency of toothbrush can reach up to 34,800 times/min, which has a plaque removal effect up to 7 times higher than that of manual toothbrush.

When you first use it, you may experience itchy or mild gingival bleeding. The reason is that the gingival is not used to such efficient cleaning. This phenomenon will generally stop within 1 to 2 weeks. If the symptoms persist for more than 2 weeks, it is likely gum problems. You may stop using and consult a dentist.