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Simple Summary: Ultrahigh-dose-rate therapy, known as FLASH radiotherapy (RT), is an emerging cancer treatment technique that offers similar tumor control to conventional RT but with the enhanced protection of normal tissue through the FLASH-sparing effect. Preclinical studies on animals and cell lines show promising results. This is significant for patients with recurrent tumors and reirradiation cases, where conventional RT has high toxicity rates. FLASH-RT can potentially improve tumor control while reducing side effects and preserving quality of life. Among the FLASH modalities, proton therapy stands out for its superior dosimetric and delivery characteristics, making it a safe and effective option for human malignancies. Despite its potential, proton Bragg peak FLASH for HN cancer remains underexplored, and this review highlights the novel proton conformal FLASH techniques, which allow for high-quality plans while minimizing radiation exposure to critical organs at risk (OARs) for HN cancer reirradiation. Ultrahigh-dose-rate therapy, also known as FLASH radiotherapy (RT), is an emerging technique that is garnering significant interest in cancer treatment due to its potential to revolutionize therapy. This method can achieve comparable tumor control to conventional-dose-rate RT while offering the enhanced protection of normal tissue through the FLASH-sparing effect. This innovative technique has demonstrated promising results in preclinical studies involving animals and cell lines. Particularly noteworthy is its potential application in treating head and neck (HN) cancers, especially in patients with challenging recurrent tumors and reirradiation cases, where the toxicity rates with conventional radiotherapy are high. Such applications aim to enhance tumor control while minimizing side effects and preserving patients' quality of life. In comparison to electron or photon FLASH modalities, proton therapy has demonstrated superior dosimetric and delivery characteristics and is a safe and effective FLASH treatment for human malignancies. Compared to the transmission proton FLASH, single-energy Bragg peak FLASH is a novel delivery method that allows highly conformal doses to targets and minimal radiation doses to crucial OARs. Proton Bragg peak FLASH for HN cancer has still not been well studied. This review highlights the significance of proton FLASH in enhancing cancer therapy by examining the advantages and challenges of using it for HN cancer reirradiation. [ABSTRACT FROM AUTHOR]