Reflexive verbs concerning the body
The dative reflexive pronoun is used in German with certain verbs when they refer to doing things to parts of the body (sich waschen) and putting on or taking off articles of clothing (sich anziehen, sich ausziehen).
Great care must therefore be taken to distinguish between the following pairs of verbs:
Ich wasche mich. (I'm having a wash.)
Ich wasche mir die Hände. (I'm washing my hands.)
Du ziehst dich an. (You get dressed.)
Du ziehst dir die Hose an. (You put your trousers on.)
The same construction is also used in German to translate "to clean one's teeth". The full present tense of this construction is given below.
As the stem of the verb putzen ends in "-z-", note that the "du" form of the verb adds "-t", and not "-st" - du putzt.