Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) said: The one in ihram may enter the bathhouse, may pull out his molar tooth, may smell fragrant herbs, and when his nail breaks he should throw it away. And he used to say: Remove from yourselves what harms you, for Allah, the Mighty and Majestic, has no need of your dirt.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9125