Darlie Cloud Comfort Full Coverage Advance Clean+ Gum Care Toothbrush has 3.3mm slim head allowing you to brush deeper and hard to reach areas at the back of your mouth. It also has a special 48-holes widened brush head that has better coverage and more efficient cleaning with each brush stroke. The dual bristles tufting with 0.01mm slim tip center bristles help to clean interdental while side bristles are soft and velvety that gently cares and massages your gums!