<qa>  What is the maximum sensitivity score of the two test teeth?This will be a single center, three day, randomized, examiner blind, two treatment arm, parallel design, stratified by maximum baseline Schiff sensitivity score of the two selected test teeth, controlled study, in participants with at least two sensitive teeth that meet all the criteria at the screening and baseline pre-treatment visits. DH will be assessed at baseline pre-treatment, post-treatment and after 3 days twice daily brushing. 