* "Safe" is subjective: What one person considers safe another might not.
* "Monster High" is a broad term: It could refer to the dolls, the cartoons, the website, the video games, or even the community of fans.
To understand your question better, please clarify:
* What do you mean by "safe"? Are you concerned about safety for children, online safety, or something else?
* What aspect of Monster High are you referring to? Are you interested in the dolls, the shows, or something else?
Once you provide more context, I can give you a more helpful and accurate answer.