Wearing a retainer may feel uncomfortable or even slightly painful at first, especially if it's a new or adjusted retainer. This is because your teeth and mouth need time to adjust to the new appliance. However, any discomfort or pain should be mild and temporary, and will typically subside within a few days to a week as your mouth gets used to the retainer.

Most people are able to talk normally with a retainer in their mouth, although it may take some practice to get used to speaking with the appliance. Depending on the type of retainer you have and its specific design, it may affect your speech slightly, especially at first.

Some people may experience a slight lisp or difficulty pronouncing certain sounds or words when they first start wearing a retainer. This is normal and should improve as you become more accustomed to the retainer.

To help adjust to speaking with your retainer, try reading aloud, talking to yourself in front of a mirror, or practicing speaking with friends or family members. With time and practice, you should be able to speak normally with your retainer in place.

The amount of time it takes to get used to wearing a retainer can vary from person to person. Some people may adjust to the retainer within a few days, while others may take a week or longer to feel comfortable wearing it.

At first, wearing a retainer may feel slightly uncomfortable or even slightly painful. This is normal, as your teeth and mouth need time to adjust to the new appliance. You may also experience some mild soreness or sensitivity in your teeth or gums.

To help adjust to wearing your retainer, try wearing it for shorter periods of time at first, such as a few hours a day, and gradually increase the wear time over the course of several days or weeks. This can help your mouth adapt to the retainer more gradually and may help reduce discomfort.

In some cases, you may need to wear a retainer for the rest of your life to maintain the alignment of your teeth. The length of time you need to wear a retainer will depend on a variety of factors, including the type and severity of your orthodontic issue, your age, and your overall dental health.