All praise is due to Allah. May Allah's mercy and peace be upon the Prophet (peace and blessings of Allah be upon him). News after: Nails must be taken care of before forty days have passed. This is because the Prophet (peace and blessings of Allaah be upon him) set a time limit for cutting the nails, cutting the hair below the navel , plucking the hair from the armpits and trimming the mustache: not to be late for more than forty days. In this regard, the hadith from the Prophet (peace and blessings of Allaah be upon him) has been narrated in Saheeh Muslim (256). Therefore, it is obligatory on both men and women to pay attention to this issue. Therefore, nails , mustache , navel hair and armpit hair should not be left for more than forty days . However, ablution is valid. Oyu will not be canceled due to dirt under the nails. Because that's as little as possible. The little things are unforgivable.