The process of getting your mouth healthy will be a continuing one. It is very important that you keep up a good routine to keep your teeth and gums healthy at home. This will involve brushing and flossing as you have been shown, and being careful to monitor the frequency of foods or drinks that will encourage decay. It is important to brush twice daily with a fluoride toothpaste. There are now many specialised formulations of toothpaste available including Tartar Control, for sensitve teeth and Total Care toothpastes.
Mouthwashes can be beneficial and again, there are many different formulations available.
Look for products carrying the BDHF logo, which means that the claims made by the manufacturer have been independently validated and are clinically proven. You will also need regular sessions with your dentist or hygienist to monitor the improvement and give you any help and encouragement. Achieving a healthy mouth does not happen instantly - it may take several months to achieve, and will need continual care to maintain in the future. Food and drinks containing sugar cause decay. A reduction in the frequency of consuming sweet things will help considerably.