Twenty American dentists were mugged Monday night by two men on a motorcycle near the busy corner of Maximo Gomez and Bolivar avenues. The foreigners, who are in the country providing free dental consultations, left their hotel around 9pm and when a first group walked near the Gomez, one of the assailants dismounted the motorcycle, gun in hand took what they had, while another group waling on the Bolivar, near the Mormon temple, where the same thugs also mugged them.