When a human bone breaks, the healing process may indeed result in a repaired section becoming *temporarily* thicker than the original bone, but this effect is localized and not permanent. Here’s how:

### **1. Bone Healing Process (Callus Formation):**
- After a fracture, the body forms a **soft callus** (collagen and cartilage) around the break.
- Over weeks to months, this is replaced by a **hard callus** (bone), which is thicker than the original bone.
- During remodeling (which can take months to years), excess bone is gradually resorbed, and the bone returns to close to its original state.

### **2. Temporary Strength Increase:**
- The hard callus is initially **overbuilt**, making the healed area stronger for a period.
- However, once remodeling is complete, the bone typically returns to nearly original strength and shape.

### **3. Long-Term Strength:**
- Bones adapt to stress (**Wolff’s Law**), meaning consistent weight-bearing or exercise after healing can strengthen the bone over time.
- If a person becomes more active post-injury, the bone may end up stronger overall due to increased loading—not because of the break itself, but because of the added physical stimulus.

### **4. Exceptions & Risks:**
- **Poor healing** (misalignment, infection, or malnutrition) can lead to weaker bones.
- **Repeated fractures** in the same area may cause long-term weakening.
- **Bone diseases** can impair proper healing.

### **Conclusion:**
- **Short-term:** The healed fracture can be temporarily stronger due to callus formation.
- **Long-term:** The bone generally returns to near-normal strength, unless additional mechanical stress (like exercise) further strengthens it.
- **Not universally stronger:** The idea that "broken bones heal stronger" is a myth unless the person changes their activity level to promote bone growth.

So while a healed fracture isn’t inherently stronger, proper recovery with increased physical activity *can* lead to stronger bones overall.