After every use in warm water and soap then scrub the inside of the bottle and nipple with a brush, rinse with warm water, then cold water to remove any soap residue. Let air dry. At least once a week, sterilize in boiling water.
Make sure that he’s being fed properly and healthy, as well as getting enough social interaction with you. You can take him for walks, play with him, etc. If you’re really worried, you could consult a veterinarian.
Hot shower for sinus, and hot or cold compress for tooth ache. You could try buying those jellies that infants and toddlers use when their teething and freeze them then bite on it for the tooth ache as well. Spicy foods are also known to help with sinus issues or congestion.
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