Please choose the correct ending to complete the given sentence: Health: [header] How to keep a cavity from getting worse [title] Brush the area carefully. [step] Ideally, brushing your teeth will help prevent cavities altogether. However, brushing is also important to prevent cavities from getting worse.

Ending1: Examine the area you're brushing the most frequently. There will be smaller cavities on an area of your body than in the surrounding area. Ending2: Try to brush as little as possible, only doing so when the dentist suggests it. [substeps] If you have any cavities, you should brush after a meal if you are prone to cavities. Ending3: Especially if there are small cavities, brushing your cavity can cause it to spread and grow. [substeps] If you don't have a brush, you can use a regular toothbrush and toothpaste. Ending4: Buildup of food stimulates the growth of bacteria. This will get into the cavity and make it worse.

Answer format: ending1/ending2/ending3/ending4