Replacement heads are specially designed for precise cleaning of teeth. The heads can last up to 3 months of use , after which they begin to crumble, lose their effectiveness and, in addition, bacteria accumulate on them. Fortunately, the heads are equipped with blue bristles that fade after 3 months, so you know its time to replace the heads. Compatibility TrueLife SonicBrush K series See also other products of the TrueLife brand, which you can find in the categories Electronics under the Christmas tree, Toothbrushes and Mouth and teeth. You can now buy the product with a 0% discount. If you are not sure about the choice of this product, be inspired by the category of Sonic replacement heads.