OKnocked-out tooth: if really has completely fallen out, rinse the tooth with cold water. Do https://nhakhoavietsmile.com/khi-nao-can-nieng-rang-thoi-gian-va-chi-phi-chinh-nha-bao-nhieu-tien/ or brush the dentistry. If niềng răng , try to position the tooth back place, but be particular it's facing the right direction. Don't try to force it back up in its