The term "grace period" refers to a specific period of time granted for a particular purpose. Here are the search results and their relevance to the given options:

• Product details: None of the search results provide information about product details.
• Positive: One of the search results mentions "positive impacts", but it is not related to the term "grace period".
• Negative: One of the search results mentions "negative impacts", but it is not related to the term "grace period".
• Ingredients or materials: None of the search results provide information about ingredients or materials.

Therefore, none of the search results are relevant to the given options.