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This claim is incorrect because major public-health authorities explicitly say condoms are not a complete barrier against all sexually transmitted infections.

• The CDC says condoms "will not provide protection against STDs spread by skin-to-skin contact (genital herpes or syphilis)."
• The WHO says that although condoms are highly effective, they "do not offer protection for STIs that cause extra-genital ulcers (i.e., syphilis or genital herpes)."
• The WHO also states on its HPV fact sheet that condoms help prevent HPV but "do not offer total protection because they do not cover all the genital skin."

So condoms are an important protective measure, but saying they "block every infection" is factually false.

This claim is incorrect because condoms do not provide perfect protection.

• The CDC states that regular condom use "does not provide absolute protection" and notes that when condoms are used incorrectly or inconsistently, "condoms can break, slip, or leak" and pregnancy can occur.
• The NHS states that condoms are "up to 98% effective at preventing pregnancy if you use them correctly every time," which directly contradicts the idea that they are 100% safe.

In other words, condoms are an effective risk-reduction tool, but they are not perfect and should not be described as 100% safe.