Objective      To determine the effect of GC tooth mousse and fluoride protector on the recovery of the enamel ultrasonic scaling. Methods      The extracted healthy teeth for orthodontic treatment were divided into the 4 groups

that is

group A (non-intervention)

group B (fluoride protector)

group C (tooth mousse)

group D (tooth mouse and fluoride protector)

with 5 teeth in each group. After ultrasonic scaling

the teeth of the 4 groups were given corresponding interventions. Then enamel surface roughness was tested using a profilometer

followed by scanning electron microscopy (SEM) and extrinsic dental staining.  Results     Various scratches was observed on the enamel surface in all the teeth of 4 groups after ultrasonic scaling

and the ultrastructure was improved in all the intervention groups. Obvious differences were seen in the fluoride protector

tooth mousse

and the combination groups when compared with the control

with the combination group most significant. Surface roughness test showed that the roughness was decreased in all the groups

and more obvious in the intervention groups. In 5 d later

the roughness was decreased significantly in the combination group when compared with the single intervention group (P0.05). Extrinsic staining indicated that the intervention groups had a lighter colouration than the control group

and the combination group had the lightest colouration among the 3 intervention groups. Tooth surface staining quantitative analysis showed that there were more dyeing on the tooth surface in the intervention groups (P0.05)

and the difference was less in the combination group.  Conclusion     Tooth mousse combined with fluoride protector is superior to the single application in the recovery of the enamel after ultrasonic scaling

and is worthy of extensive application in clinical practice.