Complete stain removal from the Enamel Use a compact cotton swab (3 mm) to apply Antivet solution (Dental Continental, México)to the stained dental piece according to manufacturer's instructions.

Replace the swab as it becomes stained and continue until the stain is removed. " This may take 1-5 minutes per tooth, but do not exceed 15 minutes in total. " We will keep the tooth moist during the process for effective results and avoid reusing stained cotton swab.

Then we will apply the neutralizing solution to the tooth with a brush or micro brush, ensuring it reaches the gingival margin. Leave it on for 2 minutes.

Once the antivet solution is neutralized, rinse the area and remove the rubber dam.

Complete stain removal from the Enamel. Product will be applied to the surface with a 1 mm thick layer; ten applications of 60s to help penetration of the gel into the enamel.

Using an abrasive rubber cup (OpalCup™ Ultradent) in contra-angle low-speed handpiece at low revolution.

Then will be rinsed with injectable water for 30 seconds between each application

Complete stain removal from the Enamel-Use a compact cotton swab (3 mm) to apply Antivet solution (Dental Continental, México)to the stained dental piece according to manufacturer's instructions.-Replace the swab as it becomes stained and continue until the stain is removed. " This may take 1-5 minutes per tooth, but do not exceed 15 minutes in total. " - We will keep the tooth moist during the process for effective results and avoid reusing stained cotton swab.-Then we will apply the neutralizing solution to the tooth with a brush or micro brush, ensuring it reaches the gingival margin. Leave it on for 2 minutes.-Once the antivet solution is neutralized, rinse the area and remove the rubber dam.

Enamel discoloration or texture by Spectrophotometer Vita EasyShade When totally removed of fluorotic white spots = success & when stains doesn't removed and surface irregular = failure

Patient reported outcome measures by visual analog scale (VAS) Is used to describe sensitivity by patient themselves in scores as ( o : no sensitivity) ( 10 : highly sensitive )