Long tooth is often used to describe someone who is old, experienced or senior in age or position. However, there are many synonyms that can be substituted for this phrase. For instance, one can use 'battle-hardened' to describe someone with a vast amount of experience. 'Venerable' can describe a person who is respected due to their age or experience. 'Senior' is also a good synonym to describe someone in a higher position or older individual. 'Ancient' is an excellent word to use when describing individuals with extreme old age. In conclusion, there are many descriptive words to use instead of 'long tooth' to describe a person's age or experience.