Although virtually unknown outside Japan, there is an extremely effective approach to periodontal home care. This approach was developed by Dr. Tsuneo Katayama (1910–2006), a Japanese periodontist with over fifty years of clinical and research experience. The “Katayama method” is complex and time-consuming, esp. at the beginning. Although I cannot claim that I was able to practice this method pefectly, I can surely attest the effectiveness of the method. Through nearly thirty years of following the method, I no longer fear gum diseases at all. I could even say that I am practically “healed.” Now, I am eternally grateful to Dr. Katayama for sharing his method in his book (Katayama, 1990; the method was also introduced earlier in Asahi Shinbun-sha, 1987). In return, I am trying to share the basics of the Katayma method and my experience in this essay, which is dedicated to Dr. Katayama.