Buy some 100% PURE clove essential oil, put some on a q-tip or cotton swab and place it on and around the painful areas. This will work as a local anesthetic. Regular natural cloves can be placed used also but won't be as effective but you could mortor and pestle them into a paste which may improve the effect.

Gargling and mouth rinsing with salt water and periodically some 100% PURE tea tree essential oil will help prevent infection as well as halitosis. Peppermint or spearmint 100% PURE essential oils can also be used to add flavor, scent, and their own beneficial properties.

Oil pulling - which is the swish-swashing of oil in your mouth for around 20 minutes - can be implemented daily to improve circulation, clear out toxins and bacteria, and according to some - heal teeth and gums.
Coconut oil is the recommended choice due to flavor and weight (viscosity), however, any food grade oil can be used. About 1tbsp of oil is required.
My concern with oil pulling is how strong are your teeth and their roots. Do they break when eating an apple? If weak, go light on the oil pulling to see if it works for you.

When using essential oils less is more. These are high concentration plant extracts which can be harmful when used incorrectly. Research potential contraindications and recommendations before using an essential oil. Research essential oil recipes for precisely the ailment which troubles you, then research again for comparison, further understanding and knowledge, and to identify more available alternative oils which could also help.

During my time using essential oils I have noted that the same oils can be used for used for many different ailments. So when used from a 'medical perspective, one finds there is typically a common collection of oils which contain a wide range of basic general healing properties. Many oils will provide equivalent healing properties as others with subtle differences. Often such equivalents can be substituted in recipes because if their common properties.
Some essential oils although sharing common basic properties have unique properties which cannot be substituted or can only be substituted by other equally unique oils. These are often more expensive.

Make sure not to consume any ABSOLUTES. These are oils extracted by methods using SOLVENTS and will most probably have adverse effects.
Make sure not to consume PURE natural essential oils without years of knowledge and experience or the recommendation and guidance to do so from a professional in this field.
Essential oils can adversely affect pregnant women by altering hormones. This can lead to miscarriage.
Essentual oils can adversely affect animals. This can lead to DEATH.
Make sure when using essential oils you are aware of those specific oils potential impact on yourself, others around you, and your environment. Use sparingly, be considerate of others, clean up after yourself - clean with isopropyl alcohol.