I have sensitive teeth and I consume a lot of acidic foods that was eroding my enamel. After the first 3 days of using Sensodyne Pronamel twice a day, my teeth felt glossy and looked shiny. After the first week my teeth felt stronger and I haven't felt any discomfort since. Sensodyne Pronamel is definitely on my purchasing list, #iswhatyoueateatingyourenamel get Sensodyne Pronamel at your nearest retailer you won't regret it.