Often, if you are not careful, if you use too much force, you will cause bleeding of the gums, especially in cold winter. This will cause great damage to the teeth. Cleaning the teeth too much will damage the natural protective film of the teeth. Use soft toothbrushes as much as possible to better protect the health of your teeth. https://www.samemater.com/toothbrush/soft-toothbrush/micron-silk-fur-care-toothbrush.html