A nurse is reinforcing teaching with a client who is to start subcutaneous heparin. Which of the following information should the nurse include in the teaching?

The correct answer is A: Use a soft-bristled toothbrush. When starting subcutaneous heparin, it is important to minimize the risk of bleeding. Using a soft-bristled toothbrush helps prevent gum bleeding. Choice B is incorrect because heparin is typically injected into the subcutaneous tissue, not deep into the muscle. Choice C is incorrect because black, tarry stools are a sign of gastrointestinal bleeding, not a side effect of heparin. Choice D is incorrect because easy bruising is not an indication of heparin's effectiveness, but rather a side effect indicating a need to adjust the dosage.