Natrelle implants - are they good? Are Mentor implants better?

• Natrelle implants, manufactured by Allergan, and Mentor implants are both safe.  
• I have used both types of implants, and neither is "better" than the other. 
• Rather than being concerned about the implant manufacturer, I would recommend spending more time understanding which approximate size implant you are interested in, and make sure that your plastic surgeon understands your goals and expectations for your new breast shape and size. 
• Best of luck to you!